Schalke coach Huub Stevens will make changes to his starting line-up as his side continue their attempt to qualify for the knockout stages of the Champions League.
Stevens, whose players take on Arsenal at home on Tuesday having already beaten them 2-0 in London, saw his side succumb to a last-minute Bundesliga defeat to Hoffenheim at the weekend.
But he said the changes were "nothing to do with the defeat", explaining: "It's our general freshness. Some of the players are a little tired after our recent busy schedule."
Schalke conceded the decisive goal in stoppage time, and 22-year-old keeper Lars Unnerstall, who has been under the spotlight after some shaky recent performances, was again criticised.
Former Germany international Timo Hildebrandt, 33, the club's second-choice keeper, had recently complained that he was not being given a fair chance to compete for the No.1 spot.
But, asked about the goalkeeping position, Stevens said only: "We have three great goalies, and one of them will be in goal."
Meanwhile, Greek centre-back Kyriakos Papadopoulos could return to the starting formation despite suffering a cut to the head against Hoffenheim.
Midfielder Lewis Holtby could be rotated out of the starting line-up, with Julian Draxler coming in for him.
"I am 22, and I know haven't played my best games recently - I am also annoyed by that," Holtby said. "But I am motivated and fit, I am ready for Arsenal."
If Schalke beat Arsenal they will become one of the first teams to qualify for the last 16, but Stevens warned: "The only thing that counts is the task ahead of us. And it isn't easy.
"Arsenal are a good side with lots of quality. I've watched their recent games very attentively. We've prepared well."