The prolific attacker has again voiced his dismay with the way he was treated this summer as his side blocked his move to Bayern Munich
Robert Lewandowski has once more hit out at the Borussia Dortmund hierarchy for not living up to their promise that he would be allowed to leave the club for Bayern Munich.
The Poland international looked set to join Dortmund's Bundesliga rivals this summer, with his contract set to expire in a year's time, but Dortmund eventually vetoed a move to the Champions League winners.
Although Lewandowski has assured supporters he will be fully committed to Dortmund as long as he plays for the club, he remains deeply frustrated that the management at Signal Iduna Park have failed to keep their own promises.
"If someone says something, he should keep his word. I'm not saying it's only about the transfer, but other things we have discussed with management and that have not materialised," he told Polish newspaper Rzeczpospolita.
"No matter how hard I will train and what I will do, the feeling that I've been cheated will still be there.
"It turns out that words spoken straight into my eyes were untrue."
Since joining Dortmund in 2010 from Lech Poznan, Lewandowski has scored 74 times, including an impressive four-goal haul against Real Madrid in the Champions League semi-finals last season.
Dortmund get their Bundesliga campaign under way on August 10 against Augsburg at the SGL Arena.