Arsenal legend Thierry Henry has warned Barcelona teammates not to underestimate his former club.

Henry hit 226 goals for the­ ­Gunners in eight seasons and ­returns on Wednesday wary of the young Guns he left behind.

He said: "They are still young but they have been playing ­together for a long time.

"Cesc Fabregas has been there seven years, Clichy has been at the club a long time and so have Song, Denilson, Van Persie and Nasri. The players are young but they are very competitive.

"When any team plays the ­current holders, people always say the champion is the favourite.

"But look at what has happened so far. Look at Lyon with Real ­Madrid and CSKA with Seville."