Mourinho is also confident that Eden Hazard will sign a new contract at Stamford Bridge.
Chelsea scored through Eden Hazard and Felipe Luis before Derby pulled one back.
After such a tremendous start to the season, Southampton’s woes continued with a fourth consecutive defeat.
Newcastle ride on Cisse double to beat Chelsea, Toure earns Man City victory while Arsenal beaten by Stoke.
This is Chelsea’s 1st defeat since the second leg of last season’s UCL semi-final against Atletico Madrid.
Southampton slumped to a second successive defeat with an 89th-minute Alexis Sanchez goal finally breaking their resistance at the Emirates.
Drogba showed just why he and Mourinho, who first signed him in 2004, are apparently inseparable.
When told about the fact that Lineker scored the winner in Spurs last win over Chelsea at The Bridge, Mourinho replied: “So, tomorrow he can’t.”
Chelsea stretched their lead at the top as Sunderland’s splendid resistance at least scattered some hope for nearest pursuers.
Sunderland will have the opportunity to end in-form Chelsea’s run of 19 undefeated matches.
Elsewhere, Chelsea beat West Brom 2-0 while Man City had to fight a tougher battle to beat Swansea 2-1.
Van Persie’s equaliser in injury time gives United a well earned draw against leaders Chelsea at Old Trafford.
Unbeaten League leaders Chelsea look to pull eight points clear of defending champions.
Striker’s seven goals in four matches make Premier League leaders Chelsea favourites against Bundesliga side.
Torres could not even command a place on the bench as Costa was scoring on his Stamford Bridge debut.