 In the 2015 UEFA Super Cup against Sevilla FC in Tbilisi, he conceded a penalty with a foul on Vitolo, which was converted by Kevin Gameiro as the opponents came from 1–4 down to take the game into extra time; Barcelona nonetheless triumphed 5–4.On 7 July 2017, Portuguese club Sporting CP announced the signing of Mathieu on a free transfer for two seasons.He scored his first goal for the club on his sixth appearance, in a 2-0 home win against Tondela.