Everton, Aston Villa and Derby County all reportedly want the 17-year-old striker, who scored 25 goals last season.
The 17-year-old has been lethal at Vicarage Road. He is now playing regularly for the under-23s, having scored 25 goals last season and bagging another 12 strikes so far this term.
The Irish Mirror reports that there is a question mark surrounding his future with 18 months remaining on his contract with Watford. Unsurprisingly, the Hornets are keen to discuss a new long-term deal with the forward.
But there is a lot of interest in him. The Irish Mirror adds that Everton, Villa and the Rams are all monitoring his situation, while a number of sides in League One and Two are said to be keen on a potential loan deal.
The report suggests that Toffees boss Marco Silva is a big fan of the youngster having been aware of him from during his time in charge of their Premier League rivals.
He will be hoping that the chance to make the switch to Goodison Park tempts Cassidy to reject fresh terms with Watford. But perhaps the likes of Villa or Derby may feel that they could present the clearer path to the first-team that may appeal to the teenager at this stage of his career.
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