Arsenal boss Mikel Arteta says the arrival of Gabriel Jesus transformed the club's culture.
Brazil international striker Gabriel Jesus, 26, left Manchester City for Arsenal last summer for 45m.
He has managed twelve goals and eight assists in 35 competitive matches since then.
"He is a fantastic player, a really important player for us. He changed our world last season. You could all see it. He will be a really important player for us," said Arteta.
"I think he brings a different energy, a different belief, a different threat, a different fear to the opponents. And he has done it in a really natural way. He contributed enormously to the step we took last season."