Manchester City manager, Pep Guardiola, has said he knew Cole Palmer was “a star player”. However, he couldn’t promise the forward enough playing time at The Etihad, before he left for Chelsea. Palmer joined the Blues in a £42.5million deal last summer. Since then, he has scored 10 Premier League goals in 20 appearances. The 21-year-old will return to the Etihad for the first time on Saturday. Ahead of the game, Guardiola was asked if he knew Palmer would be a success at Chelsea, he replied: “If he plays regularly, yes. I didn’t have any doubts about his quality. “The way he’s playing is a sta…