Smalling, who was named United's Player of the Month for October, limped off in England's defeat to Spain and failed to feature in the win over France.
But the 25-year-old admits he's ready to play following a difficult international break to face the Hornets, which will be music to Louis van Gaal's ears.
The Red Devils boss has confirmed he'll be without Anthony Martial, Michael Carrick, Wayne Rooney, Antonio Valencia, Marouane Fellaini and Luke Shaw at Vicarage Road.
"I’m fighting fit and I’m feeling good to go again," Smalling explained.
GETTY
Chris Smalling will be available to face Watford tomorrow
GETTY
Louis van Gaal will be without six key players at Vicarage Road
"It’s nice that this run keeps on going and, more importantly, that the performances keep going.
"You can play every game but you must make that impact. I’m looking forward to making another impact on Saturday."
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