Manchester United must move quickly to sign Serhou Guirassy for a cut-price fee.

The Red Devils are eager to add the forward, who is impressing in the Bundesliga, to their front line.

However, United may have to act fast if they want to secure the Stuttgart ace, who has 17 goals in 14 league games this term.

Per Bild, a release clause of £15 million is active in Guirassy's contract, but only until mid-January.

If United wait until late in the window, then he will not be available for that modest fee.

The forward is at the African Cup of Nations, which also complicates any transfer.