Juventud de Las Piedras
Born in Melo, Alaniz was a Defensor Sporting youth graduate. He was loaned to Juventud de Las Piedras in September 2011, making his debut on 15 October by coming on as a late substitute in a 1–0 win against Villa Teresa. He scored his first goal late in the month, netting the game's only in a success over Tacuarembó.