A Marlon King goal took Watford six points clear at the top of the Championship table, with Boothroyd insisting he is fully focused on gaining promotion.
"I've had no contact with Bolton, it is purely rumours," he declared.
"It's lovely to be linked because it means that we're doing well, but loyalty works two ways.
"I'm still doing an apprenticeship here and I'm happy at Watford and want to stay here until they kick me out.
"I have people who have signed contracts here after I've brought them to the club and if I expect them to honour those contracts, then I will honour mine."