The club's young keeper is on loan at the National League club, where he played against Rochdale.
Vicario is said to have been at the game, per football.london, on a scouting mission.
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He was joined by the club's goalkeeping coach Rob Burch, who was assessing Keeley.
Vicario has come into Spurs in the summer and been a revelation, taking the no.1 shirt.
He has proved the ideal replacement for the now departed veteran Hugo Lloris.