Trippier made his first Premier League start for Spurs at Vicarage Road, and he was deployed in a right-wing back role.
The former Burnley man was given licence to get forward, with three central defenders behind him, and Shearer was impressed by his performance.
“Because of the three at the back, it enabled Trippier to virtually play as a right winger and he did it unbelievably well,” he said. “He gave them width in the first half. Spurs are on the march!”
Trippier has had a testing start to his Tottenham career so far, with his chances limited.
Kyle Walker’s good form at right-back has kept him out of the team, with most his appearances coming in the Europa League to date.
Trippier hasn’t managed to catch the eye too much in European action, but his performance against Watford was impressive.
The 25-year-old looked solid defensively, and he also set up the winner, by crossing for Heung-Min Son.
Tottenham’s victory over Watford has pushed them up to third in the Premier League table, and talk of them being title contenders this season is becoming louder.