The striker moves back to Brazil after four years in Europe, and affirmed that his goal is to bring titles back to the Estadio Olimpico after a 10-year drought
The former Wigan man was introduced to the club on Tuesday, accompanied by more than 800 fans eager to welcome the man who began his career at Brazilian rivals Vitoria. The Ukrainians agreed a deal worth €6 million to release the forward, with Gremio paying €2.5m and the rest covered by players who will move to Shakhtar.
Speaking for the first time at his new club, Martins vowed to try and end a drought which stretches back to 2001, the last time the Tricolor won a trophy in a non-state competition.
"I am going to do everything possible to help the club win titles, which is the most important thing for me and for the Gremio directors," the 24-year-old told reporters at his presentation.
"I hope I can help with goals, and I hope there is a lot of them."
Martins has a Brazilian father and played for the Selecao at youth level before finally opting to represent Bolivia. He has played 31 times for the Verde, scoring 10 goals.