Berlin: Bayern Munich's record signing Lucas Hernandez took part in his first squad training session on Tuesday, four months after a serious knee operation, the Bundesliga champions reported on their website on Wednesday.
The 23-year-old French World Cup winner has yet to feature for Bayern since his 80 million euro ($89 million) move from Atletico Madrid in March.
His medical showed damage to the medial collateral ligament in his right knee that required an immediate operation.
Hernandez is unlikely to be ready for the opening game of the season against Hertha Berlin on 16 August but it is good news for his new teammates and manager Niko Kovac.
"I think the most important thing, for the time being, is that he's properly fit and starts to settle in," German international Leon Goretzka told the Bayern website.
The defender's return coincides with a media broadside aimed at the club by striker Robert Lewandowski who has called on Bayern to bring in at least three new players.
"In attack we lost three players in the shape of Franck Ribery, Arjen Robben and James (Rodriguez). And for the moment we have no new recruits for these positions," Lewandowski told Sport Bild on Wednesday.
While Robben has retired, Frenchman Ribery is out of contract and seems likely to be heading to Saudi Arabia while James has come to the end of a two-year loan period and has returned, for the moment at least, to Real Madrid.
Veteran defender Rafinha has also left in order to return to Brazil.
So far this summer, Bayern have only reinforced their defence with French world champions Hernandez and Benjamin Pavard while promising 19-year-old striker Jann-Fiete Arp has arrived from Hamburg.
The German champions have also been trying for weeks to attract Leroy Sane from Manchester City but no announcement has yet been made.
"Even if Sane comes, we need another winger," says Lewandowski who also called for a defensive midfielder or offensive midfielder.
Bayern's core team is made up of top-class internationals but, after the summer movement, the bench is now very shallow.
"Playing an entire season with 13 or 14 experienced professionals, it's going to be tough. We have 50 or 60 games, so do not just think about next week but at three, four, five or six months. And for that we do not have enough players. Hoeness and Rummenigge know my opinion," warns Lewandowski who has already discussed the matter with club president Uli Hoeness and chairman Karl-Heinz Rummenigge.
Hoeness and Rummenigge have promised to reinforce the playing ranks as they set their sights on the double of Bundesliga and Champions League.