Watford boss Walter Mazzarri feels there is plenty more to come from two-goal hero Stefano Okaka.
The Italian striker scored his first goals for the Hornets as his brace helped sink Everton 3-2 at Vicarage Road.
Okaka's introduction to life at Watford following a summer switch from Anderlecht was hindered by a hamstring injury, and he struggled on his first start for the club in last week's 3-1 defeat at West Brom.
But the 27-year-old tormented Everton throughout and came up with two well-taken goals, a stylish backheel and a near-post header either side of Sebastian Prodl's first of the season.