Barcelona are reportedly monitoring Sporting CP winger Gelson Martins and will keep a close eye on him when the two sides meet at the Camp Nou in the UEFA Champions League on Tuesday.
According to Sport's Didac Peyret, the Catalan giants are among several parties including Real Madrid, Liverpool and Manchester United that are interested in Martins, who has a €60 million release clause.
When Sporting take on Barca on Tuesday, Blaugrana boss Ernesto Valverde will be watching to see if Martins is worthy of the attention he has received.