By Amir Mir

Martin Keown has insisted it is a “mystery” why Alexis Sanchez was not used as the Arsenal attack spearhead before this season.

The former Gunners defender has been hugely impressed by Sanchez this season and compared him to Manchester City sensation Sergio Aguro.

The 27-year-old has scored five goals and provided five assists as a centre-forward in seven games in all competitions this term, with his sole appearance on the left wing coming in the 2-1 win against Southampton.

By contrast Aguero has been in scintillating form for City scoring eleven goals in seven appearances in all competitions.

Pundit Keown has hailed Sanchez in his new role, as he questioned why it took so long for him to be played as a striker.

“When Wenger signed Sanchez I thought Arsenal’s closing down from the front was going to be the best it’s ever been, and it’s been a mystery to me why it’s taken so long for him to be played down the middle,” Keown wrote in his Daily Mail column.

“He has looked fantastic there so far and he will only get better as he learns more about the position. Over the past few matches I can’t think of another striker who has contributed more to the team than him – he’s looked like Sergio Aguero of late.”

The Chilean’s standout performance was during the 3-0 win over Chelsea, where he opened the scoring and provided an assist in the comprehensive victory.

Sanchez has scored 47 goals and provided 28 assists in 101 appearances for the north London club, while Aguero has scored a mammoth 147 goals in 215 appearances for City.

Arsenal have registered 13 points from their opening six games, five points off leaders City, who they meet on December 17 at the Etihad.

In the meantime, Wenger’s men will travel to Burnley on Sunday afternoon, while Guardiola’s side take on Tottenham at White Hart Lane.

In other Arsenal team news, supporters react on Twitter to intriguing Mesut Ozil contract demand.