Arsenal were granted a work permit for defender Gabriel Paulista on Monday, confirmed the BBC.
Paulista is expected to officially seal his switch from Villareal shortly, and will have to respond on the pitch to those who have questioned his suitability for the club.
Former Tottenham Hotspur midfielder Nayim told SkySports at the weekend that he felt Paulista lacked the ability to flourish at Arsenal, commenting: "If they are looking for a player who can play the ball from the back, he's not the right player."
His hesitance is not shared by Arsenal legend Thierry Henry, who is quoted by SkySports full of belief that Paulista can be a success
He said: "Arsene knows what he needs. He obviously thinks the team is lacking a centre-back. Arsenal are going to get a young but polished player. I've heard he is a special talent."
Henry has played under Wenger and knows about how the Frenchman likes to set up his teams, even if his own time at Arsenal saw it's fair share of bad signings as well as good.
One player he feels the club need to hold onto is midfielder Francis Coquelin, who has excelled in recent weeks for the Gunners.
He said: "Before the Manchester City game you would have also said that Arsenal need a central midfielder but I think Francis Coquelin deserves a run in the team.
"He's surprised a lot of people. It's only been a couple of games but he's shown that he can do it. Who knows - maybe in a couple of years we will be talking about Francis Coquelin being the guy for Arsenal."
The French midfielder has a fantastic opportunity to make his case in this manner, with Mikel Arteta injured for three months.
Coquelin has a contract at Arsenal which expires in the summer, and the Gunners would be wise to offer him a new deal, and he would certainly be sensible to sign it.