Last year's first choice striker Mario Mandzukic has struggled to secure regular first team action at Bayern during pre-season following the arrival of Guardiola and Hitzfeld thinks a similar scenario would have been on the cards for Lewandowski in the Bavarians' 'false nine' system.
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"I really liked Mandzukic a lot. He fought himself into the team and brought a winner mentality with him. If Mandzukic is not going to play as a real No.9, then how is Lewandowski going to get playing time?
"Lewandowski is a real No.9 as well, he's no [Lionel] Messi. That's what I'm wondering about. Do you really need Lewandowski in [Pep] Guardiola's system..."
The Poland international, 24, was widely expected to join Bayern this summer, but BVB eventually vetoed the move and refused to let their star striker follow in the footsteps of Mario Gotze and join their arch-rivals.
Lewandowski's contract with Dortmund runs out in the summer of 2014, though, and he still seems destined to make the move to Bayern next year.