Schalke 04 are hoping to have Ghana midfielder Kevin-Prince Boateng back from an ankle injury for Wednesday's Champions League clash at Sporting Lisbon.
The 27-year-old attacking midfielder took part in Monday's training session having missed the Royal Blues' last two Bundesliga games and may feature in the Lisbon clash against the group's bottom side.
Schalke are second in Group G and two points behind leaders Chelsea, who they host in Gelsenkirchen in three weeks, after two draws and a win.
Ex-Chelsea coach Roberto di Matteo is definitely without Germany midfielder Julian Draxler, who picked up a leg injury in Friday's win over Augsburg, while Cameroon defender Joel Matip also misses the match in Portugal with a bruised foot.
Sporting are without defender Mauricio, who was sent off in Sporting's 4-3 defeat in Gelsenkirchen a fortnight ago when Eric Choupo-Moting's 93rd-minute penalty sealed the hosts' win.
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