"They're two players that played at the highest level for many years, they were here for so many years," Sterling told BBC Radio 5 Live.
"They were big characters in the dressing room, players that had won it, been there, done it. You look at the squad and it is a young team but you look at Ruben (Dias) who has come in, he speaks as much as Vinny (Vincent Kompany).
"He's a massive character. We haven't lost a voice in the dressing room, new people are stepping up to the plate. People like Kev (Kevin de Bruyne), he's the second captain and very vocal now. Fernandinho too.
"There has been a miss with Vinny because when he's there, I'm telling you, you know there's a match kicking off in 30 seconds. We've adjusted well."