Chelsea's hopes of winning a third consecutive Premier League title have taken a knock with a third straight draw, their first match this season without scoring.
The Premier League leaders were held to a 2-2 draw.
Liverpool moved up to third in the Premier League after they won 3-0 at Charlton Athletic and rivals Arsenal could only draw 2-2 with Portsmouth after being two goals down on Saturday.
Chelsea cut Manchester United's Premier League lead to five points after Didier Drogba scored the winner in a 1-0 victory over Newcastle United on Wednesday.
Chelsea coach Jose Mourinho said his team's comfortable 2-0 victory over Levski Sofia on Tuesday, felt more like a friendly than a Champions League match.
Arsenal manager Arsene Wenger believes their 3-1 victory over Hamburg SV in Europe will put an end to a costly Premier League jinx at their new Emirates Stadium.
Swiss internationals Johan Djourou and Philippe Senderos would be the main candidates to replace him on Tuesday.