PICTURED: Lionel Messi arrives for training with Barcelona for first time since ending his sensational bid to quit the club - and he doesn't look too happy as he prepares to work with Ronald Koeman for the first time

Lionel Messi has returned to training with the Barcelona squad for the first time since performing a dramatic U-turn over his demand to quit the club.

Messi was pictured arriving at Barca's Joan Gamper Ciutat Esportiva training HQ in his Mercedes on Monday, and his expression did not suggest that he was happy to be there.

The training session marked the first time that he and new coach Ronald Koeman have worked together on the pitch since the Dutchman took the reins at the club, which has been in crisis ever since the 8-2 humiliation at the hands of Bayern Munich in the Champions League. 

Messi arrived well before the scheduled start of training at 4.30pm BST, suggesting he might have meetings to attend before taking to the field. He certainly would have plenty to discuss with Koeman, his team-mates or any of the Barca hierarchy. 

The 33-year-old superstar gave up his fight to leave Barcelona for Manchester City last Friday, breaking his silence to reveal that he would stay put because he did not want to have a court battle with the club over his disputed €700million (£630m) release clause. Messi had told the club he felt he was contractually permitted to leave on a free transfer.

More to follow. 

A stern-looking Lionel Messi was pictured arriving at Barcelona's training HQ on Monday

A stern-looking Lionel Messi was pictured arriving at Barcelona's training HQ on Monday