(CNN) -- First it was Mario Gotze. Now Robert Lewandowski is leaving Borussia Dortmund for German powerhouse Bayern Munich. 

The sought after Polish international signed a five-year contract with Bayern Munich, Bayern said on its website while calling the 25-year-old one of the "world's top strikers." He'll join the Bavarian outfit at the end of the season, when his current deal with Dortmund was due to expire. 

"We are very happy that this transfer has gone through," Bayern CEO Karl-Heinz Rummenigge said. "Robert Lewandowski is one of the world's top strikers. 

"He will not only strength our squad, but his arrival will also give the entire club a boost." 

Some would say Bayern hardly needs it, since it won five trophies in 2013 and is on pace to cruise to yet another Bundesliga crown. 

Lewandowski co leads the Bundesliga in scoring this campaign with 11 goals and has netted 91 times in 165 games for Borussia Dortmund since joining from Poland's Lech Poznan for a bargain basement $7 million in 2010. 

His goals also helped Borussia Dortmund reach last season's Champions League final, although Bayern Munich came out on top in London. 

Gotze's move to Bayern Munich was announced last April while he still played for Borussia Dortmund and the German international became a highly unpopular figure among many Dortmund fans -- so Lewandowski might expect some jeers himself. 

Lewandowski's impending departure is a further blow to Dortmund. 

The German champion in 2011 and 2012 -- Lewandowski played a key role -- Jurgen Klopp's side has slipped to a distant fourth in the league and narrowly advanced to the second round of this season's Champions League. 
Who is switching teams?
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Robert Lewandowski
Robert Lewandowski is leaving Borussia Dortmund for German powerhouse Bayern Munich. 
Bayern Munich
Lewandowski is leaving Borussia Dortmund for German powerhouse Bayern Munich.
Borussia Dortmund
Now Robert Lewandowski is leaving Borussia Dortmund
no
First it was Mario Gotze. 
Mario Gotze
 First it was Mario Gotze
25
calling the 25-year-old
five years
signed a five-year contract with Bayern Munich
at the end of the season
He'll join the Bavarian outfit at the end of the season
striker
 calling the 25-year-old one of the "world's top strikers
yes
calling the 25-year-old one of the "world's top strikers."
five
 Bayern hardly needs it, since it won five trophies in 2013 
91
d has netted 91 times i
165
 has netted 91 times in 165 games 
Champions League final
His goals also helped Borussia Dortmund reach last season's Champions League fina
last season
 last season's Champions League final
Bayern Munich
 although Bayern Munich came out on top in London. 
not good
the German international became a highly unpopular figure among many Dortmund fans
jeers
so Lewandowski might expect some jeers himself. 
Poland's Lech Poznan
 joining from Poland's Lech Poznan
$7 million
 a bargain basement $7 million in 2010. 