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The father of a 7-year-old boy who died in the Mexico City earthquake, sent a second letter to Ronaldo: "Your gesture has helped to lessen the pain."
Mathieu, 33, who spent three seasons at the Camp Nou, left for Sporting Lisbon on a free transfer.
Denis Suarez turned down two offers to leave Barcelona in the summer because he was intent on remaining at the club and becoming a success.
Diego Costa's return to Atletico Madrid has increased the chances of Manchester United making a move for Antoine Griezmann, sources have told ESPN FC.
Uruguay international Luis Suarez has appealed for peace in the wake of football violence in his country.
Sunday's 2-0 defeat at home to Leganes followed a 1-0 loss at Sevilla and left Las Palmas in 15th place with six points from six games.