Lionel Messi of FC Barcelona celebrates scoring with teammate Ousmane Dembele in their match against Sevilla. Photo: VCG

Coach Quique Setien said Barcelona are looking to sign a striker to replace the injury-stricken Ousmane Dembele for the remainder of the season even though the Spanish transfer window has closed.

French forward Dembele ruptured a hamstring tendon on February 3 and will undergo surgery Tuesday in Finland, ­after which Barca will determine how long he will be out for.

Spanish soccer federation (RFEF) rules dictate that if a player is injured for at least five months then their club can sign a replacement outside a transfer window, as long as they are based in Spain's top two divisions or a free agent.

The injured player is not allowed to play again for the team before the five-month period has elapsed and must agree to the arrival of the new player.

Dembele's injury has left Barca with only three natural forwards in talisman Lionel Messi, Antoine Griezmann and 17-year-old Ansu Fati as Luis Suarez is out until May after undergoing knee surgery.

"If it's possible, we want to sign a player who is versatile. It's not easy, right now the market is closed and we need to get the request approved first of all," Setien told reporters ahead of Barca's La Liga game at Real Betis on Sunday.

"It's obvious that we need a player to come in and that they would help us out."

Reports in the Spanish media say they are looking at bringing in either Real Sociedad forward Willian Jose or Getafe's Angel Rodriguez.