Nelson has joined Feyenoord on a season-long loan.
He told the club's website: "It feels fantastic.
"I am impressed by how big and beautiful the stadium is. I can't wait to play."
He added: "A lot has happened to me during the transfer window. The talks with Feyenoord went well. Feyenoord sees me as a good player and wants to help me with my development. This is the place where I want to be now and I am happy that there is an agreement."
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