"His numbers are stratospheric, incredible".
Barca's South American scout Andre Cury, who has close links with Neymar and his father and helped mastermind the forward's transfer from Santos in 2013, set up a meeting with the player's entourage before Christmas and the former favourite is open to a return to Camp Nou. Real remain 10 points adrift of Barcelona.
Griezmann scored his team-leading ninth league goal of the season when he fired a spot kick over Levante goalkeeper Oier Olazabal in the 57th minute following a handball by defender Nikola Vukcevic. He was on target in the Copa del Rey in midweek but that was his first goal since October.
Coutinho became the club's most expensive signing in history when he swapped Merseyside for Barcelona but it has not all gone to plan for the club or the player.
Messi's milestone strike came moments after he appeared to be struggling.
Barca were enjoying themselves as Coutinho flicked the ball over one opponent's head and Suarez did the same through another's legs.
Elsewhere, Inaki Williams struck in either half as improving Athletic Bilbao beat third-placed Sevilla 2-0 at San Mames.
1 - Messi is the first player from Europe's big five leagues to reach 400 goals for the same club. "I can not do anything without my team-mates".
Ousmane Dembele had been replaced by Coutinho in the starting XI, but the France worldwide was introduced in the 71st minute as Barcelona looked for more goals in the latter stages. Italian media outlet Il Messaggero has said that United, along with Arsenal and Chelsea, are at the front of the queue to sign the 22-year-old who is said to have a £27m release clause in his current contract.