Hourihane made the comments about his Villa teammate following the Villans’ 2-1 victory over West Bromwich Albion at Villa Park in the first leg of the Championship playoff semi-final tie on Saturday afternoon.
Grealish played well for Dean Smith’s side and was involved in both the goals for the home team.
The 23-year-old attacking midfielder set up Hourihane for the opening goal, and then earned the penalty in the second half which Tammy Abraham successfully converted.
The youngster, who can also operate as a winger, has been linked with a move to Tottenham in the summer transfer window.
According to The Mirror, Spurs are interested in signing Grealish from Villa this summer.
The 23-year-old is reported to have a £60 million buyout clause in his contract and earns £70,000 per week as salary.
Hourihane told Sky Sports about Grealish: "Jack's the best player in the league, in my opinion. He has got so much quality.
“He is probably too good for the league. He does that every week for us, he's fantastic.”
Grealish will be a smart signing for Tottenham in the summer transfer window, but if Villa get promoted to the Premier League, then they may not feel any need to sell him.
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