Ahan, who is the brother of actress Athiya Shetty, will be soon making his acting debut in Bollywood with filmmaker Sajid Nadiadwala.
Karan praised Ahan on Twitter on Monday.
"In full on training mode... A star in the waiting. Introducing Ahan Shetty. Congratulations to Sajid Nadiadwala and Suniel Shetty," Karan captioned a photograph which featured Ahan.
Suniel also welcomed his son to the "beautiful world of films" and asked him to stay "grounded".
"God owes us nothing but gives us everything. Always stay grounded Ahan. Welcome to the beautiful world of films. Always there for you. Papa," Suniel tweeted.
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