Portugal winger Gelson Martins joins Atletico Madrid

Soccer Football - International Friendly - Belgium vs Portugal - King Baudouin Stadium, Brussels, Belgium - June 2, 2018 Portugal's Gelson Martins in action REUTERS/Eric Vidal

MADRID (Reuters)on Wednesday - Portugal winger Gelson Martins signed for Atletico Madrid on Wednesday as a free agent on a six-year deal after leaving troubled Portuguese side Sporting.

"We have been watching him over the last year and we saw him in the Europa League," Atletico manager Diego Simeone told reporters in Singapore on Wednesday.