Robert Lewandowski's decision to leave Bayern Munich this summer may have been driven from an argument with Julian Nagelsmann, after the manager tried to give him instructions.
Bayern have a problem on their hands at the moment, with Lewandowski determined to leave the club in the transfer window, despite having a year left on his contract.
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The forward has gone as far as declaring his time at the club is 'over,' even if they've currently got no plans of actually letting him go.
Lewandowski has said he doesn't seen any possibility of continuing to play for the German champions, and it could be due to a falling out with Nagelsmann.
According to German news outlet TZ, the striker was involved in a training ground argument with his manager towards the end of the season.
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There had been 'moods' from the striker during the season that Nagelsmann had noticed, but one session ended in an argument as the former RB Leipzig boss tried to advise the forward on what runs to make.
He had reportedly wanted to make wing play more efficient and wanted the striker to get into different positions, but it didn't go down well with the Poland captain.
Lewandowski replied by reminding his boss that it was him who'd scored 41 goals in a season, and not the manager, which probably wouldn't have gone down well.
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It is not the first time the 33-year-old has been unhappy with the manager's tactics, after he moved to the Allianz Arena last summer.
Speaking in November the forward said, "It hasn't been easy for me at Bayern lately to find situations for a goal or a place on the field.
"When you play offensive players and the opponents are very defensive, that's not easy for a striker."
He has been heavily linked with moving to Barcelona this summer, if the Spanish giants can manage their finances well enough into being able to afford him.
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There is a chance that he could buy himself out of the final year of his deal in Germany, which would make it cheaper and easier for him to move but would also leave a nasty taste to his departure.
Topics: Robert Lewandowski, Bayern Munich, La Liga, Barcelona, Bundesliga, Transfers