Vitesse Arnhem boss Peter Bosz will push Chelsea to make decisions early over their loan plans next season.
Bertrand Traore, Josh McEachran and Wallace spent this season on-loan at Vitesse.
Bosz hopes to have their next group of Blues added to his squad in time for the start of preseason.
"I can explain why it is important for us that they come earlier. But I also understand that Mourinho wants to see all the guys again in preseason. Only in late July, early August is it clear which players can be loaned out, though I'll keep in contact with Chelsea hoping that the boys this time arrive sooner."