Arsene Wenger defended Arsenal's decision to be the only club in Europe's top five divisions to not sign a single first-team outfield player during the summer transfer window.

The fans’ group, pointing to the club’s strong financial position, said in a statement: “This isn’t an issue that affects just one transfer window and seems to indicate a wider structural issue. In recent years Arsenal have overhauled both their Academy and their medical set-up. We urge the board to now open a full review into its arrangements for scouting and purchasing players.”

Wenger, however, told beIn Sports: “Am I happy with the investment I make? Yes, every time. I bought Sánchez, I bought Özil, I bought Cech, I bought Gabriel last year …

“But when you have to invest you have to find the players to invest in … The problem at the moment is finding the players that guarantee you are a better team afterwards.”

Wenger criticized Manchester United's decision to pay an initial £36 million for 19-year-old Anthony Martial.

“What happened last night with Monaco, who sold Martial to Manchester United for €80m, I’ve heard … Martial scored 11 goals in the French championship – that sums it up well.

“That means it’s not the money that’s missing at the moment, it’s not the desire of investment that is missing, it’s the number of players available who can strengthen the big clubs.”