The Wolves legend has been impressed with the performances of Bonatini so far this season.
The 23-year-old forward joined the Wanderers on a season-long loan deal from Al-Hilal in the summer transfer window.
The Brazilian has been a hit already at the Molineux Stadium, scoring 10 goals and providing four assists in 14 Championship starts for Wolves so far this season.
Bonatini has been one of the best players in the Championship this season and is leading Wolves’ charge towards promotion to the Premier League.
Former Wolves striker Bull, who is a club legend, has praised the Brazilian and has underlined his work-rate.
“The big thing which has always impressed me about him is his work-rate,” Bull wrote about Bonatini in Express & Star.
“In some instances he reminds me of myself, the way he is prepared to run the channels. As we have seen during his current scoring streak, he is a mean finisher too.”
According to The Mirror, Wolves can secure the services of Bonatini on a permanent contract from Al-Hilal for a transfer fee of £5 million.
Based on the Brazilian’s performances so far this season, signing the 23-year-old forward for £5m would be a bargain.