The Gunners were heavily linked with a move for Nzonzi in 2015 but the French midfielder, who was playing for Stoke City at the time, ended up joining Sevilla for £7 million.
Reports have also claimed that Emery was also keen on a move for Nzonzi last year but he was overruled by Arsenals hierarchy, who ended up signing Lucas Torreira from Sampdoria instead.
And Crouch feels Wenger missed a trick by failing to land Nzonzi and suggests Emery is doing little to counter Arsenals defensive problems.
Why arent they varying their style? Honestly, it is mind-boggling, Crouch wrote in his column for MailOnline.
You can play out from the back by clipping high balls to your full-backs – watch Ederson do it for Manchester City.
To keep doing what Emery wants Arsenal to do, with little passes around the penalty area, is just asking for trouble.
They have played six games so far in all competitions and have faced 120 shots – 96 of those have come in the Premier League, the highest total of any club.