The Chilean rejected the chance to sign for the Reds as a part of Luis Suarez’s deal to join Barcelona, with life in London cited as a major reason behind his decision.
Fans on Merseyside were left upset by the news, with the Chilean – who starred at the World Cup – having been seen as the ideal replacement for their departed number seven.
Although Arsenal are Champions League regulars and one of English football’s biggest clubs, Thompson believes that the 25-year-old attacker has made an error:
“Alexis Sanchez doesn’t know what he’s missing by not joining Liverpool,” he is quoted by The Metro.
“The passion, power and worldwide recognition of Liverpool is strong.”
Sanchez’s £30m move to Arsenal is an embarrassing one for Thompson, who recently claimed that a deal to take the star from Barca to Liverpool was done.
The Premier League runners-up – who battered the Gunners 5-1 at Anfield last term – may instead turn their attention to an Emirates Stadium target in the shape of Loic Remy.