Euro 2012 - Injury sidelines Terry for two months
Terry's right knee has been troubling him ever since he collided with a goalpost in last month's FA Cup clash with Portsmouth, and he is now due to undergo what is understood to be a small procedure to correct the problem.
Chelsea boss Andre Villas-Boas had been hoping the 31-year-old would recover in time for Tuesday night's Champions League clash at Napoli. The England centre-back took part in training on Monday, but woke up in considerable pain at Chelsea's team hotel on Tuesday morning.
It is now believed Terry will be sidelined for as much as two months, meaning he will miss a succession of games for Chelsea as they aim to secure a top-four place in the league and prolong their Champions League campaign.
Terry will also be sidelined for England's friendly against Netherlands at Wembley on February 29, sparing the national side's management a decision over his involvement in the tie.
Stuart Pearce has been tasked with picking the England squad after Fabio Capello's resignation earlier this month.
Capello quit his job with the Football Association after clashing with the governing body over its decision to strip Terry of the captaincy.
The FA took the decision to do so after the defender's court date for alleged racist abuse of QPR defender Anton Ferdinand was pushed back until after the conclusion of the Euro 2012 finals.
However, the FA did make it clear that Terry was still available for selection.