The Daily Mail says Spurs assistant boss Kevin Bond, coach Joe Jordan and scout Ian Broomfield were at Vicarage Road to watch Loach help the Hornets to a 3-1 win over QPR on Monday night.
The 21-year-old has been pinpointed as a replacement for Carlo Cudicini after the Italian was ruled out for the rest of the season following a motorbike accident.
Spurs manager Harry Redknapp admitted last week he is facing an uphill battle in trying to attract a top-class keeper to Whiter Hart Lane but he will be encouraged by Loach's comments.
He said: "If Tottenham were to knock on the door and I were to go there, brilliant. At the moment, though, I'm concentrating on trying to help Watford get to the Premier League."