Netherlands striker Ruud van Nistelrooy may have played his last game for Hamburg after being ruled out for several weeks with a calf injury he sustained against Hannover on Saturday.
Van Nistelrooy, 34, tore a muscle in his left calf in the 0-0 draw in the Bundesliga and it places further question marks against his future at the Imtech Arena given his contract runs out at the end of the season.
Van Nistelrooy told the club's website: "It happened in the closing stages. After the game, the pain got worse.
"The diagnosis is bad. I hope I can play again as soon as possible but I am sure it will turn out to be some time."
Blackburn manager Steve Kean confirmed to ESPNsoccernet last month that he was eager to take the striker to Blackburn.