Manchester United and Real Madrid's top transfer target Ilkay Gundogan finally returned to first-team training with Borussia Dortmund last weekend, after the best part of six months out injured with a stress fracture in his back.
Gundogan aggravated the problem last summer on international duty and was forced out of Dortmund's opening Bundesliga game of the season after just 56 minutes, failing to feature since after a series of setbacks.
Dortmund began their preparations for the second half of the Bundesliga campaign on Sunday with an open training session in front of 500 fans, who got a welcome boost as they saw Gundogan and Marcel Schmelzer return from injury to take a full part in the session.
United and Madrid scouts are sure to be interested observers as the German international steps up his bid to be fit for the second half of the season, with rumours of a £25m bid from some of Europe's top clubs rumbling on for much of the campaign despite a prolonged spell on the sidelines.
Both sides face a fight to lure one of Dortmund's key players away from the Bundesliga though, particularly with Jurgen Klopp's side losing Robert Lewandowski to Bayern Munich next season.
The 23-year-old is approaching the final two years of his current Dortmund deal, with the time approaching fast for the midfielder to make a decision over his long-term future.