The 78-year-old was in attendance at the Tottenham Hotspur Stadium to witness Mauricio Pochettino's reunion with Spurs on Monday evening, but he was admitted to hospital during the Blues' 4-1 win.
However, Tottenham have now provided the reassuring news that Jennings has been given the all-clear following "precautionary" tests, and the former Northern Ireland international will be fine to attend an unveiling of his statue in his hometown of Newry on Wednesday.
"We can confirm legendary former goalkeeper Pat Jennings was taken ill at last night's game and, after undergoing precautionary tests at hospital, was discharged shortly after midnight and given the all-clear to attend his statue unveiling in his hometown of Newry, Northern Ireland tomorrow. We wish you well, Pat," Tottenham wrote on social media.
Jennings played a total of 590 matches for Tottenham between 1964 and 1977 and sits third in the club's all-time appearance charts behind Gary Mabbutt (611) and Steve Perryman (866).
The 78-year-old won one FA Cup, one UEFA Cup, one Charity Shield and two League Cups during his 13-year stint at White Hart Lane, where he was named the 1972-73 FWA Footballer of the Year and 1975-76 PFA Players' Player of the Year.
Jennings also represented Spurs' bitter rivals Arsenal, Watford and Everton during his illustrious playing career and won 119 caps for Northern Ireland, a record that stood for over 30 years until Steven Davis made his 120th appearance in October 2020.