Martins participated in 15 of the UEFA Champions League matches and six of the UEFA Europa League, reports Efe.
He had also played with the Portuguese national team, including the 2018 FIFA World Cup, making his debut when he was only 21.
In the 2015/16 season, Martins was able to spare Sporting CP a loss in their first match of the season after scoring a penalty in the 90th minute.
Atletico described Martins as an "extraordinary" player who has much experience despite his young age.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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