Bayern's striker headache

It was hardly a surprise when European hotshot Robert Lewandowski joined Bayern Munich from Borussia Dortmund on a free transfer in the January transfer window. Widely considered as one of the best strikers in Europe, Lewandowski was in the final year of his contract when he announced he was likely to leave the club when his contract runs down and this was cemented when he rejected Dortmund's contract offer.
There was much gossip to where Lewandowski would soon play his football and became a drawn out saga as his contract slowly ticked down. However, it soon became clear that Bayern Munich were going to land him, with several managers like Jose Mourinho admitting that it was clear who Robert was going to join and ruling Chelsea out of the race to sign him. In the first few days of the January transfer window, it was announced by Bayern Munich that they had finally got their man.
However, Bayern Munich are not short of class upfront, as they already have Mario Mandzukic, Thomas Muller and Claudio Pizarro. Possibly signing Lewandowski may mean Bayern will play two upfront when the Polish international arrives in the summer, but with the amount of midfielders they already have in their ranks this is unlikely to happen. Bayern Munich preferably play a 4-5-1 formation to accommodate all of their midfielders and would be foolish to change that as it is clearly working, with Munich sitting top of the Bundesliga 7 points clear of second placed Leverkusen with a game in hand.
So what does the signing of Lewandowski mean? Could it be a tactic deployed by Munich to weaken rivals Dortmund and maintain the dominance they hold in Germany? The signing of Lewandowski if he is to play regularly could spell the end of Mandzukic's Munich career, but competition is something the Croatian has always dealt with at Munich. He pushed Mario Gomez out of the side, a player who was regarded as one of Europe's best strikers when he arrived at the club. He is currently first choice striker as well, ahead of Pizzaro and Muller. The signing of Lewandowski is likely to mean one of Bayern's strikers is likely to leave and gossip columns in Europe are linking Mandzukic with a move away from the club, with speculation that a move to Arsenal could be on the cards.
Lewandowski doesn't arrive at the club until the end of the season, so a striker leaving the Allianz-Arena is unlikely until the summer transfer window. Europe's major clubs will be playing close attention to the developments that happen over the coming months at Munich and Lewandowski's arrival is likely to push a striker to the exit door.