Wenger was speaking after defeat at Manchester United.
Asked about the quality of the teams in the title race, he said: "I don't know because you have for example a team like Southampton who is close to the top but they have three international players in the England squad. They have Luke Shaw is not far, they have they say [Nathaniel] Clyne is not far. That means maybe the whole Premier League has gone up. I don't think necessarily players like [Robin] Van Persie are not as good as last season or two seasons ago. It's just the whole quality has gone up."
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