The 18-year-old grasped the opportunity with both hands, earning plaudits on a weekly basis thanks to his ability to find players with pinpoint accuracy from crosses.
"Arsenal people hate me but it is what it is," Deeney told United Stand.
"Even when Arsenal are good I'll be like, 'my man was sick, you know'. Saka at left-back, he's a proper player.
"I'm not just going, 'oh, you lost, haha'. Bro, Watford lose more than most."