The former Inter Milan academy product tore a ligament during the Austrian club's preseason camping in Turkey.
The 24-year-old underwent successful surgery and was ruled out for least three months but the player has made quick progress.
Donkor joined the club on a two-year deal from Romanian side Universitatea Craiova last summer.
He made 8 appearances in all competitions for the club during the first half of the season.
Read Full StoryIsaac #Donkor wird heute bei den Amateuren seine ersten 45 Spielminuten nach Verletzung sammeln. ????????#sturmgraz pic.twitter.com/mzQbC5J68m
— SK Sturm Graz (@SKSturm) February 29, 2020
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