The wide-man arrived from Manchester City and is a big prospect in Malta.
Nottingham Forest sold Oliver Burke to RB Leipzig earlier this week.
The Tottenham Hotspur and England midfielder has vowed to improve.
Bull believes the defender should never have been allowed to leave Molineux in the first place.
The Leeds United fan remains committed to finding a Chinese investor.
Hugo Lloris played a part in Moussa Sissoko's move to Tottenham.
The defender joined Celtic on a free transfer this summer.
The BBC Sport pundit is unconvinced by the Brazilian, who completed a shock return to Stamford Bridge on Deadline Day.
Should Everton make a move for high profile free agent Sulley Muntari?
Nottingham Forest owner suggests he may not sell up entirely.