Real stay fourth in the standings on 32 points while Barca have 48 although they have played one game more.
Real Madrid's faltering title defence continued as they were held to a thrilling 2-2 draw at Celta Vigo on Sunday which saw them fall 16 points behind runaway leaders Barcelona, who beat Levante 3-0 to stay nine points clear at the top of La Liga.
Real looked to be heading for a second successive league defeat after their 3-0 loss to Barca in their last outing when Daniel Wass lobbed over Keylor Navas to put Celta ahead in the 33rd minute.
Gareth Bale instantly responded by scoring twice in three minutes to put the stuttering champions in front before halftime but Celta came right back at Zinedine Zidane's side, with Iago Aspas squandering a penalty before Maxi Gomez levelled with a header in the 82nd minute.
Aspas was denied another penalty late in the game while down at the other end Real's Lucas Vazquez hammered the ball straight at Celta goalkeeper Ruben Blanco, while Cristiano Ronaldo fired wide of the near post.
Real stay fourth in the standings on 32 points while Barca have 48 although they have played one game more. Real travelled to Vigo without Dani Carvajal, striker Karim Benzema and captain Sergio Ramos while Celta, who knocked Real out of the King's Cup last season, were emboldened after drawing 1-1 with Barca in the Cup on Thursday.
Bale made his first start in the league since September 20 after finally recovering from persistent muscle problems and pulled Real level after Wass's strike with a slick first-time finish before giving them the lead by knocking a pass from Isco in with his back heel.
Celta appealed for Navas to be sent off when he felled Aspas and was only shown a yellow card while the Costa Rican was also let off when he stepped off his line before diving to his right to palm away the striker's spot-kick.
"We made a lot of errors, we gave the ball away a lot, something we don't normally do and we did it at important moments in the game, when we could have caused them more damage," Real coach Zinedine Zidane told reporters. "We have to stop making these errors and be more consistent."
Barcelona had seen their lead over nearest challengers Atletico Madrid reduced to six points on Saturday but restored the gap to nine after Lionel Messi, Luis Suarez and Paulinho scored in a routine win over Levante.
CUSHIONED HEADER
Messi was back in the starting line-up after missing the King's Cup draw with Celta Vigo on Thursday and marked his 400th game in La Liga by opening the scoring in the 12th minute, volleying Jordi Alba's cushioned header into the net.
Suarez struck his fifth goal in four games running by controlling a cross from Sergi Roberto and slamming the ball high into the net in the 38th minute. Brazilian international Paulinho added an extra shine to the win by tapping in as the game drew to a close.
"We wanted to continue our run of wins and although we were favourites we knew Levante were a strong side that hadn't lost away from home in the league since September," said Barca coach Ernesto Valverde. "We were very good in the first half but the pace changed in the second half and Levante could have scored."
After the game club record signing Philippe Coutinho appeared at the Nou Camp to pose for photographs a day after completing his 142-million-pound($192.54-million) move from Liverpool to Barca.
Here are highlights
(Inputs from Reuters)
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