The Chelsea manager believes Sunday's clash with the Premier League champions comes at a good time.
The Chelsea manager has ruled out making another bid for Tottenham midfielder Luka Modric in January.
After a nasty collision, Drogba laid motionless on the Stamford Bridge pitch for almost five minutes.
Chelsea striker Didier Drogba was knocked unconscious during Saturday's 3-1 win over NorwiCh City.
Chelsea had several penalty appeals turned down in the 0-0 stalemate.
Didier Drogba was on target again as Chelsea chalked up their 11th successive league win over West Bromwich Albion.
Javider Hernandez and Park Ji-sung were the two marksmen for United.
Chelsea has eight games left and is 11 points behind United.
A stunning strike by Didier Drogba and goals by Florent Malouda, Nicolas Anelka and Ramires sealed the victory.
Elsewhere, Tottenham lost 2-1 at Everton and Blackburn beat Liverpool 3-1.
The Blues had trailed 2-1 at Stamford Bridge until Drogba and Terry scored in the last six minutes.
Chelsea still moved level on points with third-place Manchester United.
Arsenal have 32 points, with Chelsea third on 30, one behind Manchester United.
Chelsea has just one win in the last six league games and walked off the pitch to boos.
Defending champions made sure they will be top of the Premier League heading into the international break.
Chelsea's total of 12 goals is a Premier League record for the first two games.
The win leaves the Blues, who also thrashed West Brom 6-0 in their opening game, top of the EPL table.
Drogba was the top scorer in the Premier League last season.
Didier Drogba scored a hat trick to lead the defending champion to a 6-0 win over West Bromwich Albion.
They came into the World Cup as superstars, but with more than half of the tournament over, they failed completely.