The target-man has played a key role since Hasselbaink has taken charge, and he seems to be one of the players to have benefitted the most from the Dutchman’s arrival.
Polter has looked a threat in recent matches, and his performance in the R’s 1-1 draw with Blackburn Rovers last night was arguably his finest to date.
Hasselbaink doesn’t believe that Polter has reached the top of his game yet, however, and he insists that the 24-year-old can improve further.
“He's a handful, and there's a lot more to come," Hasselbaink said. "We want him to be a bit more selfish and thinking more about himself in the box.”
Polter only played seven times before Hasselbaink arrived, but he has now featured in six of the R’s last seven matches.
The German striker has had big boots to fill in the absence of Charlie Austin, but he has managed to find the back of the net twice.
Unfortunately for Hasselbaink, his arrival has not sparked such an improvement in every member of the QPR squad.
Rangers’ draw with Blackburn means that Hasselbaink has failed to win any of his first seven matches in charge, but the former Burton Albion boss insists that he is not panicking.
"Overall I'm happy with the performance and commitment,” he added. “We were compact and solid, and it was reassuring. The win will come."