Borussia Dortmund duo Mats Hummels and Lukasz Piszczek are confident of facing Hoffenheim on Saturday despite their injury problems this week.
Captain Hummels was withdrawn at half-time of Thursday's 1-0 Europa League last-32 second-leg win at Porto, which gave Dortmund a 3-0 aggregate triumph, due to hip and back complaints.
However, the Germany defender says he came off merely as a precaution.
"I've got a bit of a problem with my hip flexor and my back is a little tight," he told Dortmund's official website.
"If it had been the final, I would have played through it, but given the aggregate score-line at that point and the congested fixture list we have got coming up, I thought it best to err on the side of caution."
Full-back Piszczek did not even make the squad due to a muscular problem, but the Poland international says he was also playing it safe.
"I am suffering from a slightly stiff muscle. As a precautionary measure I didn't play," he said.
"I hope everything will be okay for Sunday, but we certainly won't be taking any risks."