On 2 August 2012, Liédson agreed on a return to Flamengo, signing until December of the following year. In late January of the following year he came back to Portugal, joining FC Porto on a loan until the end of the season. On 11 May, he was involved in the goal that clinched the title for the "Dragons" against rivals S.L. Benfica in "O Clássico"; put on as a substitute by manager Vítor Pereira alongside Kelvin, he assisted the youngster's added-time winner.