The Arsenal star scored the winning spot kick to help Chile lift the trophy on home soil after tasting FA Cup glory with Arsenal during his first season at the north London club.
Sanchez used his Instagram account to share the picture above of the post-match celebrations and post a motivational message.
He shared the picture and wrote: “Success has the taste of hard work… it is delightful to the palate for those who work for their future and harmful for those wasting time. Good night.”
Sanchez helped Arsenal finish in third place in the Premier League to ensure Arsene Wenger’s side qualified directly for the Champions League group stage next season.
He scored 16 goals and providing eight assists for his team-mates in 35 appearances.
He also scored both goals in the FA Cup semi-final against Reading and helped the Gunners end the season with silverware after scoring in the final against Aston Villa to secure a 4-0 victory at Wembley.
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news