Former Arsenal striker Carlos Vela is confident he can inflict defeat on compatriot Javier Hernandez when Real Sociedad meet Manchester United in the Champions League on Wednesday evening.
The Premier League champions host Real at Old Trafford with the Spanish side heavy underdogs to claim a result, despite the patchy form of David Moyes' side so far this season.
Vela, meanwhile, returns to England for a competitive fixture for the first time since he left Arsenal on a permanent basis, having ended his spell at the Emirates Stadium by joining Real Sociedad the summer transfer window of 2012.
The 24-year-old Mexico international has been able to realise his potential since his departure from Arsenal, with 14 goals last season followed by four in eight so far this term, along with two assists.
Vela could find himself up against Mexico teammate Chicharito when Real face Manchester United in their Group A encounter, and has informed the striker that he must be prepared for a surprise defeat.
"I wish him all the luck of the world, but this time he has to lose," Vela told reporters.
Real Sociedad have lost both of their European fixtures so far this season, having been condemned to defeat by both Shakhtar Donetsk and Bayer Leverkusen.
Manchester United, meanwhile, share the lead at the top of the group, having beaten Leverkusen at Old Trafford and secured a draw in Donetsk.
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