The 34-year-old has been sidelined since October and had knee surgery in December. However, the centre-forward has flown to Portugal for the first leg of Forest's Europa League quarter-final.
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Forest boss Vitor Pereira said: "He has started to train with the team. He is available for the game.
"He is working with us, we need to manage him a little bit physically but he has travelled. It means he is available to be in the game tomorrow.
"He is an experienced player, he scores goals and it's important to be ready for the team in this moment because we face a lot of challenges."
Wood has made two appearances for Forest's U21 yeam, including scoring in a 3-0 win over Newcastle last month.