Grealish is undoubtedly Villa's star man, scoring seven goals and providing six assists this season.
But despite his heroics, Villa's Premier League status is under major threat as they sit two points away from safety.
To compound matters, relegation will almost certainly mean Grealish leaves in the summer.
A number of clubs have been linked with Grealish, including Manchester United and Everton.
Will Jack Grealish leave Aston Villa in the summer? (Image: GETTY)
And Hourihane believes Grealish must focus on keeping Villa in the top flight and then consider his future.
He told Sky Sports News: "Jack's obviously hugely talented, he's our talisman and he's had a fantastic season.
"He's been linked with so many clubs, lots of top teams around Europe. It's going to be a tough summer and a tough decision for Jack.
"Hopefully, first and foremost, he keeps us up - that is the most important thing for the football club.
Jack Grealish is Aston Villa's talisman (Image: GETTY)
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