Barca have now gone three games without a LaLiga win having picked up five points out of a possible 21, suffering defeats by Leganes and Las Palmas in their previous two home games. They are three points behind Atletico having played a game more.
Pedri sent the Catalans ahead but second-half goals from Rodrigo De Paul and Alexander Sorloth helped Diego Simeone's side move three points clear at the top of the table, having played one match fewer than Barca.
Diego Simeone's red-hot Atletico are one of the most in-form teams in Europe on an 11-game winning streak in all competitions and looking like a well-oiled machine with Antoine Griezmann, Julian Alvarez and Rodrigo de Paul firing on all cylinders.
La Liga leaders Barcelona stumbled 1-0 at home against Leganes on Sunday as they suffered another blow in the Spanish title race.
Diego Simeone's side have been in fine form and continued their winning run across all competitions with a deserved home triumph, pulling provisionally level with league leaders Barcelona.
Real missed the chance to move above leaders Barcelona in LaLiga as they stay second on 37 points from 17 matches, one behind the Catalans who host Leganes on Sunday when Atletico, in third place on 35 from 16 games, welcome Getafe.
The 23-year-old was forced off with a muscle injury in their 4-0 thrashing of Osasuna at the Bernabeu earlier in November
"We changed the position of the forwards, with Mbappe outside and he did well, like Vinicius inside," said Ancelotti.
Raphinha and Robert Lewandowski's goals put the Catalans in a healthy position but Marc Casado's red card in the 82nd minute helped Celta start the fightback to snatch a point.
A dummy dressed in a Vinicius Junior shirt was hung from a bridge near Real Madrid's training ground ahead of the Copa del Rey quarter-final clash against Atletico Madrid on Thursday.
Barcelona coach Xavi Hernandez apologised Sunday for a comment he had made about Dani Alves, who was arrested earlier this week following sexual assault allegations.
Barcelona coach Xavi Hernandez said Saturday that he is in "a state of shock" after Dani Alves's arrest on sexual assault allegations.
Atletico Madrid have signed Memphis Depay from LaLiga rivals Barcelona, the two clubs said on Friday, with the Netherlands forward penning a 2-1/2 year contract.
Real Madrid will host city rivals Atletico Madrid in the Copa del Rey quarter-finals next week after the draw was made at the Spanish FA's headquarters on Friday.
Barcelona romped to a 5-0 win over minnows Ceuta to reach the Spanish Cup quarter-finals on Thursday, riding the wave after winning their first trophy of the season last week.
Joao Mendes, son of former Brazil and Barcelona forward Ronaldinho, is undergoing trials with Barca's youth team, Spanish media reported on Thursday.
Saudi Arabian club Al Nassr have denied reports that Cristiano Ronaldo has a clause in his contract where the Portugal forward is to serve as an ambassador for the Gulf country's 2030 World Cup bid.
Former Barcelona and Brazil defender Dani Alves is under investigation over an allegation that he sexually assaulted a woman in a nightclub in Spain last month, Catalonia's Supreme Court said on Tuesday.
Ousmane Dembele's strike sent Barcelona three points clear at the top of La Liga with a tense 1-0 win over Atletico Madrid on Sunday.
