Arsenal aren't the only team to strengthen their attacking options this window, though, as Manchester United signed Romelu Lukaku and Chelsea brought in Alvaro Morata, while Manchester City have a handful of new signings.
"Honestly, he's an absolute animal", Walcott said. "His physical attributes are going to be key for us this season", Walcott said. "He's incredible. I see him in the gym every day". "If you look at the number of players that are out on loan, they can call a few back". He eats the right food and he's professional. You can see the power he's got when he's got the ball, his pace and everything. He's a great addition to the squad.
"I'm pretty well for that hit and for the deep cut I suffered, I feel quite well".
Given some of the transfer fees that have been forked out by Premier League clubs, Kolasinac could turn out to be the bargain of the summer.
According to Wenger, that makes this Premier League one of the hardest ever to win. "He is an intelligent player and we have a game backed on mobility and technique and I think he can integrate with that well", said Wenger, who is now entering his 22nd season at the Gunners' helm. We know what we have to do this season. He's going to show something different and he's going to get fitter, stronger and quicker. It's how we react.
"We can't really dwell on the past any more, we need to focus on our strengths".More news: DfT reveals victor of West Midlands rail franchise
An FA Cup triumph last May salvaged their season and led to the Frenchman extending his stay by penning a new two-year contract. We are still learning it. "It is working for now and we will stick with it".
But the Arsenal boss is hoping the 26-year-old can emulate Zlatan Ibrahimovic by setting the Premier League alight after hoping across the English Channel.
And the Bosnia-Herzegovina international's new team-mate Theo Walcott believes he is "beautiful" to watch in his own way.
"A goalscoring record is not necessarily transferable from the French league to the English league, that's for sure. But of course at the moment I have 33 players and it's hard to manage such a high number on a daily basis".
The north London side have beaten Leicester at home in their last 10 Premier League fixtures - the most out of any side in the division. The star playmaker is once again an injury doubt ahead of Friday night's game.
"We were never close", he added when asked about Arsenal moving for Mahrez.