Manchester City manager Pep Guardiola hailed his two-goal Champions League hero John Stones – but warned he has some way to go before he can be called world class.

England defender Stones found the net with two powerful headers as City thrashed Dutch champions Feyenoord 4-0 in Rotterdam on Wednesday to send a message of intent to their European rivals.

After a stuttering progression through the group phase last year, Guardiola was delighted at the strong start.

"Last season we were not able to win one game away (in the group stage)," he said.

"If you want to win, you have to beat them at home."