Chelsea are considering a move for Dimitri Payet and Alvaro Morata, if reports are to believed.
Payet is said to want out of the London Stadium and manager Slaven Bilic revealed on Thursday the France international is refusing to play for the club.
Costa, meanwhile, could find himself in a similar situation at Chelsea having not been named in the squad to face Leicester City on Saturday after allegedly falling out with manager Antonio Conte during training.
Real Madrid's Morata is Conte's preferred choice to replace him, say The Sun.
So where could Payet and Morata fit into Chelsea's side?
talkSPORT has assembled a possible XI, in a 3-5-2 formation, featuring the rumoured transfer targets. Check it out by scrolling through the gallery above.