There's been talk Walcott will be moved on at the end of the season.
"I was surprised because just because one player doesn't play two or three games it doesn't mean he isn't an important player for us or we want to put him out or want to do something with him," Silva said.
"Football is not like that. We have 23 players but we can only play 11 and the coach has to decide.
"At the moment, Richarlison is playing in his position and is doing well but it doesn't mean Theo is not trying and doing well.
"And so in that moment I was surprised and I want to show the respect Theo deserves coming from me and the protection he deserves because he is a very good professional.
"If he is not playing at the moment then it is my decision and he has to prove his quality to me during every session and in the match, and I have to decide.
"I was surprised in that moment and I showed my surprise to the question."
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!