The Danish striker – who was released from Arsenal at the end of last season – published the photo on his Instagram account on Friday in which the 26-year-old can be seen tanning in the sun with nothing but a bra to protect his modesty.
The former Gunners forward accompanied the revealing picture with the words: “Remember to protect yourself against the sun.”
Bendtner has been linked with moves to Eintracht Frankfurt and Aston Villa this summer, after his eight-year spell at Arsenal came to an end after the club decided against renewing his contract.
He managed just 24 goals in a total of 106 Premier League matches for the Gunners between 2005 and 2014, and has been out on loan spells in two of the past three seasons, with Sunderland and then Juventus.