Barcelona had given permission to the 33-year-old French player to train with the Lisbon team.
Jeremy Mathieu trained on Monday with the Sporting Lisbon squad, the Portuguese club that could be his next destination.
Barcelona had announced last week that they gave permission to the French defender to train and be tested with the Portuguese club before a possible transfer. As reported by the Catalan club, his future may be in Lisbon.
Mathieu is one of the players featured in the photos that Sporting uploaded to their official Twitter account on Monday.
Vejam só quem já veste de verde e branco pic.twitter.com/v7Anpozuob
— Sporting CP (@Sporting_CP) 3 July 2017
"FC Barcelona has given permission to Jeremy Mathieu to train and be tested during his vacation period at Sporting Club de Portugal. After this period, the three involved parties will make a decision about the future of the French player," published from the official blue and garnet site.
The 33-year-old French player, with a contract until June 2018, arrived at the Catalan team in the summer of 2014 from Valencia.