Coutinho started the 1-1 draw with Eibar on the bench before coming on in the second half but limped off the pitch during stoppage time as Barcelona finished the game with 10 men having made all their substitutions.
The club reported a few days after the game that the Brazilian had undergone surgery and would be out for “approximately three months”.
However, it appears the injury is more severe than first thought with another surgery required.
“Philippe Coutinho underwent surgery successfully by Dr Rodrigo Lasmar on a meniscal cyst in his left knee under the supervision of the club’s medical services,” a statement read.
“The player is not available for selection and his recovery will dictate his return to action.”
MEDICAL NEWS | @Phil_Coutinho had a meniscal cyst in his left knee successfully operated on by Dr. Rodrigo Lasmar, under the supervision of the Club’s medical services team. Coutinho is out and his recovery will determine his availability. pic.twitter.com/ea8lIYVosl
— FC Barcelona (@FCBarcelona) April 5, 2021
Up until his injury on December 29, Coutinho had been a regular contributor under Ronald Koeman.
The Brazilian made 14 appearances in all competitions, scoring three goals and assisting two more.
Barcelona are second in the league with 65 points, trailing Atletico Madrid by a point. The Blaugrana still have 10 matches to play, including nine in La Liga and a Copa del Rey final clash against Athletic Club.
Depending on how his recovery goes, the midfielder may also be a doubt for Brazil at the Copa America, which is due to kick off on June 13.