Arsenal and Everton target M'Baye Niang has rejected a fresh approach from Spartak Moscow and has been signed off with stress.
The striker has been told he can leave AC Milan this summer and the club are looking to sell him before the transfer window shuts.
The Frenchman, who was on loan at Watford for the second half of last season, has been linked with both Arsenal and Everton over the past three months.
Spartak Moscow, however, have been leading the race for Niang and they thought they had got their man after having a bid of £21m accepted.