Hoger was banned from training with the first team as a disciplinary measure following the 2-0 defeat to Cologne just over a week ago.
At the same time, Kevin-Prince Boateng and Sidney Sam were both sacked by the Gelsenkirchen club, but Hoger was on Monday allowed to return to full training.
“After talks with the club’s sporting management, the midfielder will return to full training and be available for matches with the Royal Blues,” said a statement on the club’s website.
Schalke end the season at Hamburg next weekend having secured a place in the Europa League thanks to a 1-0 win over Paderborn on Saturday.
That result still did not placate the anger of their fans, though, with director of sport Horst Heldt confronted by fans who blocked the VIP entrance to the stadium after the final whistle, insulting Heldt and other club managers.
Next season will be the first in four in which Schalke will not participate in the Champions League, having reached the knockout stages of the competition in each of the past three campaigns.