Borussia Dortmund coach Juergen Klopp refused to be drawn on rumours regarding the future of Robert Lewandowski on Thursday.
Lewandowski has been widely linked with a move to Bundesliga rivals Bayern Munich, while Manchester United have also been linked with the striker.
Speaking ahead of his side's clash against Hamburg on Saturday, Klopp said the speculation would not affect Lewandowski.
"I couldn't talk to him this week. I can't say anything new over it," Klopp said about the transfer speculation.
Asked if it would have any effect on the 24-year-old's performances, Klopp said: "No. Not for him and not for me. And for the rest I don't give a shit. So, everything is good."
Dortmund could welcome back centre-back Neven Subotic for the clash after he returned to full training.
"Neven is fit. Now we have to wait. It would be great if he could've played in the friendly against Cologne," Klopp said.
"But he has been taking part in full squad training this week."
Klopp's men are 12 points behind Bundesliga leaders Bayern Munich, with the title race looking all but over.
After losing 3-2 to ninth-placed Hamburg in September last year, Klopp said it was important for his side to collect all three points this time around.
"It was the most remarkable game of the first half of the season. Actually not a bad game for us but we lost it 3-2," he said.
"And then thought we're going to retrieve these points in the second leg game."
One positive for Klopp is the extension of midfielder Kevin Grosskreutz's contract, with the midfielder set to stay for at least two more years.
"This week, my players have asked me a riddle," Klopp said.
"They've asked me the question: 'what have Kevin Grosskreutz and Lionel Messi in common?' They've both extended their contracts. I think both teams are happy with the decisions."