Lech was able to remain at the top of the league. their most successful result was fourth place in the 1990 season which enabled him to participate in the 1999-2000 UEFA Cup, where they defeated Liepajas Metalurgs in the qualifying round, and lost to IFK Goteborg in the first round. However, a couple of days later, the year 2000, Lech was relegated to the second division following nearly 28 years of being in the top division. The Lech's debut season as a second-tier club was one of disaster because they were close to dropping into the 3rd division. It was only through an incredible effort that Lech's club was saved from being relegated and even secured promotion in the following one season into the premier division.
In the first year following returning back to the I league (2002-03) Lech focused on keeping the club in place. The next season started with an extremely negative atmosphere with the Kolejorz. After just five days, the club appointed the new coach Czeslaw Michniewicz. The sudden appointment of the new coach proved to be shocking, considering that Lech ended the season in the sixth spot. But the most significant thing was the victory over a Polish Cup by defeating their greatest adversaries, Legia Warsaw, in the final two games of 2004. The next day the crowd in Poznan were ecstatic over the win from Lech at Lech's Super Cup against Wisla Krakow. Even though the subsequent two seasons didn't yield any results of that amount, Lech managed to finish at the top of the table every season with head coach Franciszek Smuda.
Smuda created a formidable team after the addition of players such as Robert Lewandowski, Hernan Rengifo, Semir Stilic, Marcin Zajac, and Rafal Murawski. In the Ekstraklasa season 2008-09, Lech had a great season, finishing in third place, and was able to qualify for the UEFA Europa League thanks, in part, to scores of Robert Lewandowski. 19 May 2009 was the day that Lech was awarded the Cup for the fifth time after defeating Ruch Chorzow with a solo goal scored by Slawomir Peszko in Stadion Slaski.
The next year, Jacek Zielinski replaced Franciszek Smuda who was appointed as head coach of Poland Polish national side. With the help of many of the players who earned third place and won the trophy in the previous season Zielinski was able to guide Lech to the sixth victory in their history during the season 2009-2010. Lech's striker Robert Lewandowski returned to be an important player in attack and was the leading in the championship scoring 18 goals. When they played in the tournament of 2010-11 Champions League, they were eliminated by Sparta Prague in the third round, and were without Lewandowski who was sent from Borussia Dortmund. Borussia Dortmund. The club's most successful European appearances was their 2011 UEFA Europa League, in which they defeated Dnipro Dnipropetrovsk to enter the group stage of the tournament for the first time. Lech was third in their group alongside Manchester City, leaving Juventus and FC Salzburg out of the tournament. But they were removed from the tournament by S.C. Braga, runner-up of the tournament a few months after in the round of 32 following their victory at home in Poland (1-0) but losing to Portugal (2-0).
In the 2021-22 campaign, when Lech celebrated 100 years of existence The team coached by Maciej Skorza was runners-up at the Polish Cup, losing 3-1 against Rakow Czestochowa, and won Lech's eighth championship. It was the first time they had won it in seven years.
In the first year following returning back to the I league (2002-03) Lech focused on the long-term stability of the club. The next season started with an extremely negative atmosphere for the Kolejorz. After just five days, club appointed an entirely new coach, Czeslaw Michniewicz. The surprise appointment of the new coach proved to be an unexpected event, as Lech ended the season in sixth place. The most important thing, however, was winning the Polish Cup by defeating their greatest adversaries, Legia Warsaw, in the two final games of 2004. The next day the fans of Poznan were ecstatic over the win from Lech during Lech's Super Cup against Wisla Krakow. While the following two seasons didn't have any successes of this amount, Lech managed to finish at the top of the league each season under the guidance of the coach Franciszek Smuda.
Smuda created a formidable team following the arrival of players such as Robert Lewandowski, Hernan Rengifo, Semir Stilic, Marcin Zajac, and Rafal Murawski. The Ekstraklasa 2008-09 season Lech enjoyed a fantastic season. He finished third place, and was able to qualify for the UEFA Europa League thanks, in part, to scores of Robert Lewandowski. On May 19th, 2009 Lech took home the Cup for the fifth time, winning against Ruch Chorzow with a solo goal scored by Slawomir Peszko in Stadion Slaski.
The next seasons, Jacek Zielinski replaced Franciszek Smuda as head coach of Poland nation's team. With the majority of the players that earned third place and won the trophy last season Zielinski was able to guide Lech to their sixth title in their history during this season. Striker Robert Lewandowski returned to be an attacking reference and was the leading scoring player of the championship, scoring 18 goals. As part of the tournament of 2010-11 Champions League, they were eliminated by Sparta Prague in the third round without Lewandowski who was transferred from Borussia Dortmund. Borussia Dortmund. The club's most successful European appearances was their year 2010-11 UEFA Europa League, in which they beat Dnipro Dnipropetrovsk to enter the group stage of the tournament for the first time. Lech placed 2nd in the group, along with Manchester City, leaving Juventus and FC Salzburg out of the tournament. They were, however, removed in the round of 32 by S.C. Braga, runner-up of the tournament a few months after in round 32 following their victory the tournament in Poland (1-0) but losing to Portugal (2-0).
In the 2021-22 campaign, in which Lech was celebrating its centennial celebration, the Lech team coached by Maciej Skorza finished second at the Polish Cup, losing 3-1 against Rakow Czestochowa. took home the club's eighth title the first time in seven years.
Kolejorz penned a second chapter in the club's history during the 2011-11 UEFA Europa League campaign. After being eliminated from the competition by Sparta Prague during Champions League qualification, they advanced through to the finals of the Europa League. This time, the Polish underdogs were up against the biggest names in football: Juventus and Manchester City. In Turin a hat-trick from Artjoms Rudnevs led to the surprise draw of 3-3. After a rout of the English team at home by 3-1 Lech was able to climb the ranks of the team. The match in the final against Juventus occurred in difficult, snowy conditions and ended with the draw of 1-1. It was enough to place Lech Poznan into the knockout stage for the Europa League.