Barça tried to sign Coutinho in summer, however he arrived in January after a though negotiation
Barça signed Philippe Coutinho in January 2018 for 150 million and he became the most expansive signing in the club's history. It was not easy to make the deal with Liverpool, he was their best player and the club did not want to let him go. However, the Brazilian had an important role in the agreement and Coutinho could finally arrive to Barcelona.
But, Liverpool was a great dealer. Barcelona News Club has known one of the secret clauses in the deal that Liverpool included. Barça will not be able to sign any Liverpool's player until 2021. The first of these three years withouth a negotiation with the English club has been done. In the last years, Barça have just signed Mascherano and Coutinho from Liverpool, but they have wanted to avoid more signings.