"Our fans know Alexis [Sanchez] will not extend. They have accepted that idea."Arsene Wenger reckons Arsenal fans have come to terms with the idea of Alexis Sanchez joining Manchester United this month, but that seems far from the case.Sanchez is set to join a long list of players to have swapped the Gunners for a Premier League rival, including Robin van Persie, Samir Nasri and Emmanuel Adebayor.Arsenal fans now despise the trio and it wouldn't be surprising if they feel the same way about Sanchez when he eventually moves up north.It's easy to understand why Sanchez wants to leave, of course. The Chilean has won two FA Cups with Arsenal since joining in 2014, but that isn't good enough.Sanchez moved to the Emirates Stadium with the understanding he could challenge for the Premier League and Champions League with Arsenal.But three-and-a-half years on, the closest Sanchez has come to achieving those goals is coming second in the 2015/16 Premier League term, behind Leicester City.And in terms of the Champions League - well, Arsenal didn't even qualify for this season's campaign and are currently playing in the Europa League.What Arsenal fans must accept, then, is that Sanchez has given his all to the club but now feels he needs to move elsewhere in the Premier League to realise his dream.And it would appear the Chilean actually feels a bit sad about leaving judging by his comment on Arsenal fan Troopz's Instagram today.Troopz, who regularly appears on ArsenalFanTV, posted the following on Instagram after bumping into Sanchez in London recently.

TROOPZ SAYS GOODBYE TO SANCHEZ...

Troopz is clearly gutted about losing Sanchez but appreciates what the 29-year-old has done for Arsenal.

What he probably didn't expect, though, was a response from Sanchez.

As you can see in the screenshot below, Sanchez commented on Troopz's post using two sad-face emojis before deleting it.

...SANCHEZ RESPONDS

Interesting. Troopz also fired shots at Wenger in his Instagram post, describing the Frenchman as the "one common denominator" whenever Arsenal's best players leave.

Perhaps Sanchez agrees with that, too.