The former Arsenal forward has picked Walker ahead of Bellerin in his best XI from players at the Gunners, Tottenham, Manchester City and Leicester City.
"It's a tough one at right-back as I don't think there are any exceptional options, but I've gone with Kyle Walker because he's an absolute beast of an athlete and has more ability than Hector Bellerin,” Nicholas told Sky Sports. “Pablo Zabaleta should be the player I'm picking but he hasn't done anything this season.”
Walker has scored one goal and created 17 chances in 21 Premier League appearances for Tottenham so far this season.
The 25-year-old England international right-back has a pass accuracy of 79% and a shot accuracy of 80%, and has won 30 headers, 10 dribbles and 41 tackles.
Bellerin has created 13 chances in 23 Premier League games for Arsenal so far this campaign.
The 20-year-old Spanish right-back has a pass accuracy of 85% and a shot accuracy of 33%, and has won 25 headers, 35 dribbles and 32 tackles.
Pablo Zabaleta has played in just four Premier League games for City this season, and on paper he is (arguably) the best right-back in England.
Arsenal will face leaders Leicester at the Emirates Stadium on Sunday, while City will take on Tottenham at the Etihad Stadium.