Vlasic has enjoyed a successful season on loan at CSKA Moscow, scoring seven goals and registering four assists, and believes further additions by Everton next summer will make it impossible for him to force his way back into Silva's plans.
But the Blues boss said: "He wants to play 90 minutes every week and when we took the decision it was for him to play every week and become stronger for this club.
"Let's see what will happen in the future. When we took that decision it was not to attract offers to sell him. It was to see if he can be ready to play for our club.
"When I took the decision it was me and Vlasic , not just him. I told him what was my idea and he told me his idea as well.
"We'll see what we will do."