The latter announced the upcoming season as being his last for the Premier League side.
Foden, who competes with Silva for a midfield starting berth, does not want his senior teammate to depart.
Speaking about Silva eventually leaving, the 19-year-old said to reporters: "It's going to be a shame.
"I'm not thinking about that too much because I don't want it to happen. He's here now so let's try and be happy.
"He's still a great player, you could see on Wednesday how sharp he is even at the age he is. He's still a special player."