Martínez made his West Brom debut on 11 February 2006 in a 6–1 loss at Fulham, coming on at half time as a substitute for Thomas Gaardsøe; he received a yellow card in the game, and afterwards, manager Robson called the entire defence "shocking".[3] His only other game was a start away at Everton in which he scored to put his team 2–0 up, but also conceded a penalty with a late foul on Mikel Arteta, from which Duncan Ferguson scored the equaliser in a 2–2 draw.[4]
Valenciennes
In January 2008, Martínez returned to Europe on a 21⁄2-year deal at Valenciennes FC of the French Ligue 1, for a fee of €1.2 million.[5][6] On his debut on 12 January, the team won 2–0 at home to AS Saint-Étienne.[7] In his final game on 23 February, he and Le Mans FC player Anthony Le Tallec were sent off for fighting in a brawl that started when Valenciennes' Steve Savidan scored while Le Mans' Romaric was lying injured; Le Mans won 2–1 away.[8]
Martínez returned to his country's top flight at Rampla Juniors and River Plate again. In February 2019, he made a return to European football leagues for the first time in nearly a decade, as the 36-year-old signed for AD Ceuta FC in the Spanish fourth-tier Tercera División.[1] He went back to Rampla, now in the Uruguayan Segunda División, and ended his career with Villa Teresa in the same league.[16]
Martínez died on 17 July 2021 of suicide, aged 38, as a result of a depression caused by COVID-19-related inactivity.[18] The Uruguayan Football Association suspended matches all remaining fixtures of the weekend upon learning of his death.[19]