The 26-year-old has found game time tough to find at City this season and claimed that he would consider a move away should he continue to be left on the bench.
After an impressive summer for England at Euro 2020, many tipped Sterling to rediscover his form for his club but it's been far from that, with the winger starting just twice in the Premier League this season.
However, the former Liverpool man has been linked with Newcastle after a Saudi-backed consortium completed the Â£305m takeover last week, whilst Barcelona are also reportedly keen.
Sterling admitted he might be 'open' to departing the Ethiad Stadium despite winning three top-flight titles during his six-year stay at the club so far.
It has sparked some discussion about where he could move to next, but Guardiola reiterated Sterling's importance to his City side.
Speaking in his pre-Burnley press conference, the Spaniard said: "I didn't know it. I didn't think the club knew.
"Raheem is our player, hopefully he will be an incredibly important player for us. I don't know if he wants to play more."
He added: "Riyad (Mahrez) doesn't play and he doesn't complain, Joao (Cancelo) too. I cannot assure them, I cannot assure how many minutes each one plays. Always they have to speak on the pitch," he said.
"Not Raheem, all of them. They know they are going to play minutes, all of them are involved.
"What I want from Raheem and everyone is they have to be satisfied to be here and delighted to be here. If that's not the case he has to take the best decision for his family."
Sterling will hope to make a rare league start and impress when City host Burnley on Saturday afternoon.
The reigning champions currently sit in third after losing just once in seven matches and will be hoping to continue their fine recent record against Sean Dyche's men.