Lavery has recently returned to Wednesday from a loan spell at League One outfit Chesterfield, and Bullen clearly feels that he has the ability to make an impact back at Hillsborough.
The first-team coach says that the 22-year-old is a 'nightmare' for defenders and his goalscoring instincts could be invaluable to the side.
"When he turns and starts running at defenders, he’s a nightmare to play against," he said. "He’s so direct, powerful and quick. Caolan just wants to score goals and you can’t buy that.”
This season has been a frustrating one for Lavery, by his own admission, as he has had to watch on from afar for most of it.
Injury halted his progress at the Yorkshire club, but his loan move to Chesterfield appears to have got him back to full match sharpness.
The academy graduate has played in both of Wednesday's last two matches since returning to their ranks, and he has made a positive impression when on the field.
He scored in Wednesday's last game against Rotherham United and will be hoping to use that strike as a building block, as he looks to impress over the remainder of the campaign.