The West Ham United man was a nuisance to Juventus on Sunday.
The towering hitman wreaked havoc on Juventus' defence by scoring twice at the Olympic Stadium on Sunday as West Ham lost 3-2 in their final pre-season friendly of the summer.
Carroll's aerial presence was evident at both ends of the field but especially in Juve's box, with his first goal stemming from a header, while his second was directly scored with his head.
The 27-year-old has received a bit of stick in recent years for his awkward style, but it certainly seems to be an effective one and the Italian manager admits he likes him as a player.
"He is a very good player and can make any team dangerous, he is especially good from set pieces as we found today," Allegri said via The Mail.
"The defence was a new line, we should have defended better having conceded two goals but you have to give credit to Carroll, he is very strong and good in the air."
Chelsea boss Antonio Conte might have been worried to see Carroll have such an impact against Juve.
Conte, who managed the Italian side until 2014, will need to figure out a way in which to combat the big man when West Ham visit Stamford Bridge on the opening weekend of the Premier League season.
Chelsea manager Antonio Conte during the press conference