Robert Lewandowski's ongoing fallout with Bayern Munich saw him row with manager Julian Nagelsmann over his tactical instructions during training - with the star forward irked by the coach telling him what positions to take up for crosses.
Lewandowski's eight-year spell at the Allianz Arena looks almost certain to end this summer after the Poland captain declared that his 'story was over' in Munich, though the club have been left frustrated by going public with his desire to leave.
He has just one year left on his contract but has urged the club to cash in on him now amid links to Xavi's Barcelona - with the striker admitting 'something died inside me', which has made him consider a new challenge.
And more revelations have come out about his feud with the club, as German outlet TZ claimed he had a disagreement with Nagelsmann on the training ground last season.
Nagelsmann had sensed Lewandowski's 'moods' on a number of occasions, it says, and during one session he had advised the player about his positioning and told him the runs he wanted him to make when his team-mates crossed the ball in for him.
But a tetchy Lewandowski reportedly fired back at him, reminding the coach it was he who had netted 41 goals at the time, and not him.
Lewandowski had previously hinted of frustrations about tactics under Nagelsmann, saying it had 'not been easy' to flourish in attack - despite going on to smash in 50 goals in 46 games.
'It hasn't been easy for me at Bayern lately to find situations for a goal or a place on the field,' he said in November. 'When you play offensive players and the opponents are very defensive, that's not easy for a striker.'
The same outlet claims Lewandowski butted heads with Bayern once again in December, when club doctors advised him not to fly home for Christmas after picking up an ankle injury - fearing the cabin pressure at cruising altitude would hinder his recovery.
But Lewandowski was desperate to spend time with his family and ignored the club's instructions - it alleges - renting his own private jet and flying home anyway.
His bid to exit Bayern and his outspoken recent press conference and interviews have seen Lewandowski brandished as 'selfish' in the last week.
'I just want to leave Bayern,' said Lewandowski. 'Loyalty and respect are more important than the work. The best thing to do is find a solution together.'
The Poland striker hoped Bayern would let him move to Barcelona but told Polish website Sport Onet: 'They didn't want to listen to me until the end. Something died inside me - and it's impossible to get over that. '
Lewandowski furiously hit back at attacks from the press after his comments and insisted it was beneficial to both parties for him to leave.
'I'm not a selfish person,' he said in an interview with Bild. 'I know what I had at Bayern and appreciate it very much. I also know that I've been doing my best not to disappoint the club and the fans for the past eight years. After this time I feel that it is time for a new stage.
'I respect FC Bayern and its rules. But changes, especially after such a time, are part of the life of the club and the player. I hope that doesn't come across as selfish. I have a contract, but I also tried to make it clear to the club how I feel.
'I said from the start that we should look for a solution that would be good for both sides. Bayern is one of the biggest clubs in the world, a dream club for many great players.
'I think it's better for Bayern to invest the money they can get for me than to keep me until the end of my contract. I don't want to force anything, that's not the point. It's about finding the best solution.'
Lewandowski remains certain that he will 'find an agreement' with Bayern to let him leave, and said it was important for his state of mind that he experienced something new this summer - admitting 'break ups are part of football'.
'I have great respect for FC Bayern for what we have achieved in the past eight years. I appreciate it very much, this club and this city have become a home for me.
'I've been very happy there for years. I met a lot of wonderful people on and off the pitch. But breakups are part of football. If I feel like I need a change mentally, it's fair to say so. This is my opinion.'