The Brazilian midfielder returned to Tyneside after international duty at the World Cup, making an instant impact on the return to Premier League action by assisting Miguel Almiron in the 3-0 away win at Leicester City.
Speaking on his award, the fan favourite said: "It is always special to be recognised by supporters. They always show their love for me and I love them, so it's nice to receive the award.
"December was a different month with the World Cup and I missed Newcastle when I was away because this is a special place for me. It was important to continue our good form that we had before the winter break and Leicester on Boxing Day was a big result for us, coming back to the season.
"We need to keep our confidence and momentum now as we have a busy January with big games coming up."
Voting for the FUN88 Player of the Month takes place after every match in the club's post-match email.
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