Definition of "underrated"

Koeman identified Southampton’s third as their finest goal of the game. Jack Cork, the most underrated player at a much-lauded club, swept the ball out wide to Tadic, who waited for Cork to run to the back post before chipping the ball across to him to slam in a deserved goal from close range, despite an attempted block by Vito Mannone.

2014 October 18, Paul Doyle, “Southampton hammer eight past hapless Sunderland in barmy encounter”, in The Guardian