Adam Himmelsbach has an article up about Poirier:
Celtics forward Guerschon Yabusele, who is also from France, said he has known Poirier for about 10 years. They have faced each other several times, and Yabusele said Poirier’s improvement in recent years has been obvious.
“He got stronger,” Yabusele said. “He has better hands. His confidence is different. He sets the screen and rolls fast to the rim, he has the capability to grab rebounds, and is a good shot blocker. He’s able to finish at the rim strong and all the little things we can use. He played this season in Euroleague and he was playing really good, too. So I know he’s more mature, more prepared, and definitely better. So I really think he can help the team.”
Celtics representatives saw Poirier play in person more than 10 times over the last two years, including when his team matched up in 2018 against the Turkish club Fenerbahce, which then featured Wanamaker.
One league source who is familiar with Poirier’s game said he did not start playing basketball until he was 17 years old, and acknowledged that as recently as four years ago “he was not that good.” But since then he has combined his obvious physical tools with a better understanding of the game, and he has become more of a force.
He is a good rim runner and is active in pick-and-rolls, and he should give the Celtics some of the rim protection they will be losing with the departures of Horford and Baynes.
Poirier is officially listed at 6-11, but in Europe — unlike in the NBA — those heights are usually measured while not wearing shoes. In the US, he could be listed at 7-1, a source said.
On Tuesday, Yabusele’s eyes went wide as he considered Poirier’s imposing size.
“He’s a tall guy and he can jump,” Yabusele said. “The way he finishes at the rim sometimes, the way he’s strong with the ball, it’s really something that not all the big men have. To be able to be really tough with the ball and finish strong and go to the line and make the free throws, it’s a plus.”
https://www.bostonglobe.com/sports/celtics/2019/07/02/celtics-sign-french-center-vincent-poirier/8VtcCPQZK5JjV1AWLpu3uN/story.html