Carlo Ancelotti acknowledged David Luiz could have been sent off against Manchester United and feels Chelsea are 'still alive' in the title race.
Chelsea came from behind to beat Premier League leaders United 2-1 at Stamford Bridge, with Luiz equalising in the second half before Frank Lampard's decisive 79th minute penalty.
However, two minutes before Lampard struck, Luiz was lucky to escape a second yellow card from referee Martin Atkinson following a trip on United's goalscorer Wayne Rooney.
Ancelotti believes Atkinson had a tough decision to make in a high-octane encounter, but conceded his January signing could have been dismissed.
"There was a lot of intensity and it was not easy for the referee to decide every time," Ancelotti told Sky Sports.
"David Luiz could be lucky but there was a lot going on on the pitch so the referee decided he didn't see this."
The result puts Chelsea 12 points behind United with a game in hand and a trip to Old Trafford still to come, and Ancelotti is staying upbeat about his team's prospects.
He added: "It was a good performance and we are still alive.
"We played well, it was a very difficult game and we found a fantastic opponent but the team played really well to still go forward when we are losing 1-0.
"We kept going with strength, intensity and power in our performance.
"It was really good but if you don't play well, you cannot beat Man Utd.
"This improves our table, but we don't have to look at that, just stay focused on our other games. Our next game is on Monday so we prepare for that.
"It's far to Manchester United, but our performance was important, there are a lot of matches and we are ready to play at our best."