The two Portugal internationals are now competing on opposite sides of the northern city, with Fernandes joining United from Sporting Lisbon in January.
United haven't won the title since 2013, and Silva has been quick to remind his compatriot.
He told 5 Para a Meia-Noite show: "I went to Troia with some friends and it was a lot of fun. We ran, played tennis. Now I've been here in Manchester for 10 days and I'm sick of it.
"I spoke to [Fernandes] about three days ago. He's winning 1-0 in the games between us here, but he still has to eat a lot of soup to reach the titles."