Arsenal boss Arsene Wenger has concerns over UEFA's planned Financial Fair Play laws.

The timescale and exact details are yet to be confirmed and, speaking at Friday's press conference, Wenger admitted he now had concerns over FFP.

"I am less optimistic about it coming in than I was a year ago," he said. "And when it comes in, it depends on with what kind of rules.

"I am not sure that UEFA has completely worked out all the rules that will make it work.

"UEFA has been challenged by the Sion case when they excluded them [from the Europa League for fielding ineligible players] and it looks like they are scared they could be challenged by the big clubs if they bring in [FFP] by force.

"So I am not sure they will be capable of imposing it.

"I am hoping they are because I am a big fan of it but I am less convinced than a year ago."