Francisco Moura's second-half strike earned hosts Porto a 1-1 draw against 10-man AS Roma in the first leg of their Europa League knockout round play-off on Thursday.
The 32-year-old, who captained the Dutch to third place at the 2014 World Cup in Brazil, has been overlooked by coach Danny Blind, who is not convinced about his form with Fenerbahce.
"Our club has reached an agreement with Gelson Martins, making him a new Atletico player," said a statement from last season's La Liga runners-up.
Luuk de Jong scored a hat-trick and Memphis Depay netted the winner in the third minute of stoppage time as PSV Eindhoven beat Feyenoord 4-3 in a thrilling clash that put them four points clear on Wednesday.
Anthony Martial and Zlatan Ibrahimovic scored twice each to help Manchester United ease into the League Cup semi-finals with a 4-1 home victory over West Ham United on Wednesday as Arsenal suffered a 2-0 home defeat by Southampton. Martial netted twice in the second half to take the tie at Old Trafford away from West Ham, who had levelled through Ashley Fletcher following Ibrahimovic's opener after two minutes. The Swede added the fourth deep into stoppage-time.
Leicester beat Southampton to open seven-point gap at the top.
Title-chasing Tottenham Hotspur made hay in the sunshine as Son Heung-min scored twice in a 4-0 thrashing of Watford that closed the gap on Premier League leaders Chelsea to four points in Saturday's early kickoff.
The 20-time English Premier League champions are far from their best, but, in the final analysis, it is the results that matter, and at the moment they are on a winning spree, says Bikash Mohapatra