The Bees winger found the net four times during the month as well as contributing three assists.
Sergi started the month by winning a penalty as The Bees beat Rotherham United 2-0 and days later he scored his first goal for more than 18 months in a 2-2 draw with Blackburn Rovers. He set up a goal in the win against Nottingham Forest and then again in the win over Reading before crossing for Dasilva to score the winner against Newcastle United in the Carabao Cup. On Boxing Day he scored a brilliant hat-trick in the win at Cardiff City.
Despite Sergi's fine form it was Derby's midfielder Bielik who took the award.
There's another chance for the 23-year-old as he's on the shortlist, alongside Bees striker Ivan Toney, for the PFA Fans' Player of the Month prize.
You can vote for Sergi and Ivan here