Arsenal manager Arsene Wenger has admitted that he was surprised Manchester United were able to sign Anthony Martial from AS Monaco earlier this month.

The 19-year-old striker joined the Red Devils for £36m, but Wenger suggests that Monaco had previously maintained that the youngster - who scored 15 goals in 68 appearances for the club as a versatile forward - was not for sale.

"He was more a winger in his whole career and he played the final part of the season last year as striker," Wenger said at a press conference.

"But Monaco's statement was always that the two players that would not move were Martial and [Layvin] Kurzawa, so I thought they would maintain that.

"But in the end both of them moved."

Martial has scored four goals in his first five appearances for United.