Chelsea have made contact with Sporting for striker Conrad Harder, having asked Bayern Munich to make a permanent offer for Nicolas Jackson.
On Saturday the Blues withdrew permission for Jackson, 24, to have a medical at Bayern for an initial £13m loan move, just after Liam Delap suffered a hamstring injury.
They also contacted Harder and Sporting to sound out a potential move after Delap's injury in the 2-0 win over Fulham on Saturday.
On Sunday Jackson remained in Germany and is keen to leave Stamford Bridge, but because of the change in circumstances Bayern are being asked to re-negotiate for a permanent deal to help fund a new striker at Chelsea.
