The Gunners head into the game looking to secure a victory to underline their status as genuine Premier League title contenders this season.
Sanchez helped Arsenal return to winning ways with a 2-0 victory at Bournemouth last weekend to leave them third in the table and five points behind the high-flying Foxes heading into Sunday’s showdown.
Arsenal know that a win over Claudio Ranieri’s men would leave them just two points behind the Premier League leaders heading into the final 12 games of the season.
Sanchez has recently made his return from a hamstring injury and will be hoping to start Sunday’s game at The Emirates.
And the 27-year-old looked in good spirits as he relaxed at home on Thursday night in the build-up to Sunday’s crunch clash.
Sanchez posted the picture above on his personal Instagram account and wrote: “La princesa, the princess.”
Arsenal have not won the title since the 2003-04 season.
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news