But he has now admitted he was wrong to speak out without seeing replays first, and concedes that Arsenal could have been awarded a penalty for a foul on Alexander Hleb in the first half.
"I've got to hold my hands up and say I was wrong to a certain extent," Sanchez told Sky Sports News.
"The incident regarding Hleb was probably a good shout for a penalty.
"My initial instinct as a manager is always to protect my own players so, without seeing the incident; I spoke perhaps a bit too rashly.
"That said the one for the penalty I've seen them given and I've seen them not given.
"But I was speaking too much with adrenaline. Sometimes you shoot from the hip when you should wait a little bit longer."