The latest news from Milan suggests the Brazilian playmaker could forfeit their biggest game of the season thus far
Sky Sport Italia reports the Brazilian playmaker walked off the Milanello turf before the rest of the squad with a problem.
Robinho had only just returned from a groin injury which forced him to miss Brazil's friendly against Ghana, as well as his club's 2-2 Serie A draw with Lazio on Friday.
Coach Massimiliano Allegri was hoping to have him back from the trip to Camp Nou, but the latest inidications from Italy are that he may be in doubt.
Milan have not confirmed the news officially, while Robinho has until Tuesday to prove his fitness for the trip to Camp Nou.