The former Barnsley boss moved to Leeds United at the start of February.
Heckingbottom arrived from Barnsley at the start of February, but has only won one of his seven games in charge so far - losing three.
Despite his confidence, however, Leeds owner Radrizzani has admitted the 40-year-old "needs to prove that he deserves this club" and hopes "he will get better results in the next games".
The Italian businessman - who earlier attacked the Whites' players over a lack of commitment, passion and spirit - told the Jim White show: "I'm pleased with this choice [to appoint Heckingbottom], particularly with his leadership and communication skills and motivation.
"Obviously, like everybody he needs to prove that he deserves this club - including myself. As I just said before about the players, he’s in the same boat - he needs to prove himself.
"But I'm convinced he can be a good coach for the club, even though he’s young and might lack a bit of experience he can close this gap with the motivation and leadership that he has already shown in the training sessions.
"Hopefully he will get better results in the next games."
Heckingbottom is the third manager of Radrizzani's Leeds reign, which began with a 50 per cent stake in January 2017.
Shortly after seizing full control of the Elland Road outfit four months later, the 43-year-old oversaw Garry Monk's resignation and hired Thomas Christiansen as the Englishman's successor, before sacking him six weeks ago.
Radrizzani's predecessor, Massimo Cellino, went through seven Whites managers in three years at the helm.
Should Leeds fans be alarmed by Radrizzani's Heckingbottom comments?