Paul Pogba has been pulled out of Manchester United's friendly against AC Milan in Cardiff on Saturday.
United manager, Ole Gunnar Solskjaer, claimed the Frenchman has a back spasm.
Pogba remains at the centre of transfer speculation this summer, with both Real Madrid and his former club Juventus linked with a move.
At the end of last season, the 26-year-old cited his desire to pursue another challenge three years after rejoining United from Juve.
But the Red Devils are yet to receive any offer for him.
Pogba has featured in United's pre-season matches this summer but won't face the Italian giants at the Principality Stadium.
"At the end of the session today, Paul got a back spasm, the same issue he had last week, when he missed the session in Norway.
"But I think he'll be available early next week," Solskjaer told the United website.