Emiliano Martinez has heaped praise on Arsenal manager Mikel Arteta.
The Spaniard took over last December, and despite finishing 8th in the league, walked away with the FA Cup in his first season in charge.
"Arteta is a great coach, he changed the structure of Arsenal, he gave us a game plan," he told Marca.
"He is one of the best modern trainers today. In six months he has won a title – the FA Cup, one of the best cups in England and one of the oldest in history.
"He's very smart, in my opinion, he's going to be one of the best coaches in the world.
"I have no doubt that he can lead the Spanish team. Guardiola said that at Manchester City everyone had learned from Arteta.
"In training we see that he has a clear idea of the game, he surprises us every day."