The Germany international has been strongly linked with a move to Arsenal.
“It would be bad manners [to talk about my future],” Mertesacker told Sky Deutschland.
“I have a contract until June 2012 and I do not really give much thought on anything else.
“My club is in a difficult situation this season and I like to focus just on this.
“For me it is too far into the future deciding what might be on my cards in two years from now.
“I do not really want to even guess what might be on then.
“We are right into a situation where we are going to need everyone and I like to help my club out of there.”