Barcelona coach Ernesto Valverde says a deal for Jeisson Murillo was due to an "emergency situation".
The defender has arrived on-loan from Valencia.
For the coach he was a must because the team was in an emergency situation and needed "a centre back with experience".
"It was an emergency situation. We were looking for a player with experience, who knew La Liga. A priority," explained Valverde.
Valverde said he is also pleased with the summer signings. Of Arthur and Lenglet he said "they fit in very well and have moulded absolutely with our style."
On Malcom he said: "He has not played as much as the others but we hope that he will help us. He's a winger, a different player, with a big future ahead of him."