Alexis, 29, moved to United this week in a huge swap deal which saw Henrikh Mkhitaryan move in the opposite direction.
However, widespread reports on Thursday claimed Alexis had already travelled to Manchester to seal his switch to United when he was due to take a drugs test.
Speaking to the press this morning, Wenger said: “On the administration side, it was ours.
“On the day, he had not moved so maybe it was down to us.”
He added: “On Monday there was a lot going on. It was a special day for Alexis as you have to do paperwork and travel.
“Negotiations were going on and it’s a special event for him to miss a drug test. Overall he’s been tested so many times here.
“I’m quite relaxed because we have nothing to hide here and we always try to do our best to cooperate with doping control. I’ve pushed for football to do more for doping. This was a special day.
“The most important is that the intention is right. The intention of Alexis was not to hide, neither was ours. We have nothing to hide.”
This is how folk reacted to the news on Social Media – includes some humorous inclusions:
Wenger appears to accept Arsenal at fault for Sanchez drugs issue. Something, all you angry United fans, we suggested might be the case.
— Matt Lawton (@Matt_Lawton_DM) January 26, 2018
Mercenary, sex scandal, car cost, drugs test.... We’re one cycle away from them accusing Sanchez of being a clone of Hitler.
— United Religion (@Unitedology) January 25, 2018
So Sanchez misses a drugs test but it’s ok cos you was signing for Utd yep ok
— steven haslam (@HaslamSteazzy) January 26, 2018
Since Alexis Sanchez signed for Manchester United the Press have:
— Billy Meredith (@BigPert_MUFC) January 26, 2018
• Accused him of sending texts to a Young girl...
• Accused him of being a drugs cheat...
JUST WRONG!!! They have ZERO morality...Maybe we should stop clicking!#MUFC