Chilean internationals Sanchez and Vidal posted a photo enjoying their off-pitch time together.
Chile smashed five past Venezuela at the weekend in an international friendly, and their two most acclaimed stars celebrated by sharing a barbecue together.
The 25-year-old shared the photo of himself and teammate Arturo Vidal, who was strongly linked with joining him in the Premier League over the summer.
Manchester United were rumoured to have attempted to sign him from Juventus, and had it worked out differently the midfielder would have been opposing Sanchez at The Emirates next weekend.
United supposedly had concerns over Vidal's knee and so did not push harder with their interest, and while the Chilean had a slow start to the season in Italy, he has recently returned to his best form.
With the one midfielder United did sign, Daley Blind, suffering a knee injury of his own last night, the club's decision not to push harder to sign Vidal as well looks like even more of an error.
The pair have one more fixture to negotiate before returning to their clubs, with Chile hosting Uruguay in a friendly on Wednesday.