The Gunners’ midfield maestro has already scored seven goals this season since his £16million summer switch from Malaga.
And that includes a treble in the 5-2 win at Reading on Monday.
Martinez said: “Having experience helps — he could cope with the demands of any league.
“You’ve got two moments to come to England, when you’re quite young before you go to the big clubs in Spain, or you come at the later stages like Fernando Morientes or Fernando Hierro when you’ve been at the top clubs.
“But he came to the Premier League at the right time because he was mature enough.
“Since day one he has performed at a very good level.”