Wenger, whose side return to Premier League action with a trip to Watford on Saturday, said Sanchez was among a group of players heavily relied upon by his nation - similar to Zidane with France, Beckham with England and Messi with Argentina.
"Both players are happy here".
"We live in the world where people have opinions and sometimes they are right and sometimes they are not always proven right on the longer period".
"You need players who have quality and Mesut Ozil is one of the best players in the world". You can always find the example.
He was then asked if that meant they could leave in January and he said: "Yes, it's..."
Ozil and Sanchez are out of contract at the end of the season and Wenger said: "Once you are in our kind of situation we have envisaged every kind of solution so yes, it's possible".
Wenger said he was uncertain if Sanchez would be ready to face Watford, questioning his mental state.
This isn't the first time Wenger has been blasted by his former player, with the pundit regularly picking faults with his former boss for some time now.
The performance has been undermined by the credibility of the opposition, but Arsenal fans now want to see Wilshere tested in the Premier League.
Wenger added, however, that Wilshere would never be able to reduce his intensity.
"Tackling is part of his game. You can not ask a guy not to go into any contact", Wenger said. Sometimes when he accelerates individually he pushes the ball too far and gets confronted.
"Our chairman Steve Williams has been really working hard to raise funds for a new 4G pitch, stand and academy for the kids, so I am hopeful with the help of people like Paul, we can raise the profile a lot".