Blackburn boss Steve Kean has given Hoffenheim striker Vedad Ibisevic a 24-hour deadline to decide on a move to Ewood Park.
A fee has been agreed with Hoffenheim for Ibisevic with personal terms also close to being settled.
However, there are concerns over the striker's fitness with the Bosnian struggling with injuries over the last couple of seasons.
Kean is hoping to do a deal for the front-man, but is lining up a swoop for out-of-favour Ajax forward Mounir El Hamdaoui if the move for Ibisevic fails to happen.
"We've got permission to talk to him," Kean said of Ibisevic. "We're trying to get personal terms agreed and then accelerate it to a medical.
"He had a very good record until his first knee injury. Then since then he's had another little injury.
"He's not played as much recently. But before all that he'd had a very good goalscoring record.
"If it doesn't get done today then we'll probably move on to the other one. I had a good meeting with the other player and he's a player that will move on if not to us then to another big club in Europe. It was a good meeting.
"It won't be both though. We are looking at one of the two.
"We need someone with a track record of scoring goals. You look for someone with a goal every two games then you look at all the different markets for that."