In their continued absence, Chelsea could only draw 1-1 at Newcastle on Sunday, meaning they failed to reclaim top spot in the Premier League and now lie second, two points behind leaders Manchester United.
The Blues have taken only four points from the last 15 available to them in the league.
Despite retaining the best defensive record in the division, with eight clean sheets to their name, they have not looked as solid in recent matches, conceding three at home to Sunderland on 14 November and gifting Newcastle their opening goal on Sunday when Alex's back-pass beat keeper Petr Cech and gave Andy Carroll a simple finish.
Terry's return will be a timely boost for Ancelotti's side, who have been without their influential skipper since the 1-0 win over Fulham on 10 November - their only victory in their last five league matches.
Equally, the return of Terry's England colleague Lampard - who has not played since a 2-0 win over Stoke on 28 August - will strengthen the spine of the side.
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