 Three days later, Mathieu headed in a corner to send Valencia into a 1−0 lead at the Santiago Bernabéu but Real Madrid battled back to secure a 2−2 draw as Valencia conceded another late stoppage time goal.On 23 July 2014, Mathieu signed a contract with FC Barcelona for the next four seasons, with an optional season.The cost of the transfer was €20 million and the buyout clause was set at €50 million.