Guardiola could still be looking to sign on a central midfielder, after Chelsea closed the deal with Jorginho.
Delph and Gundogan will be able to act as deputies to Fernandinho, but City will also be looking to strengthen their midfield.
Sterling is going into the final two years of his contract, and City could look to keep him on, despite the club seeming laid back about the situation.
Manchester City will kick off their pre-season on Saturday morning, as they take on Dortmund.
They have made it clear that they will not want players entering the final years of their contracts without some sort of resolution.
Sterling had a fantastic season with City, and saw his potential asking price rise in the World Cup in Russia.
Gabriel Jesus and Leroy Sane will also be in City's plans for the future.
Both players had strong seasons which saw the club create a record-breaking title victory, and earn £100,000 a week.
Guardiola will be looking to build with young players coming through the ranks.
He has been quick to snap up players recently, with De Bruyne, Otamendi, Silva and Fernandinho all agreeing to sign fresh deals.