David Marshall
The 30-year-old Scotland international has been linked with Gunners a few times over the years and after Cardiff’s relegation is thought to want to make a return to the Premier League.
He was linked with a £5m move to West Brom over the summer before they eventually signed former United bench warmer Anders Lindegaard.
With plenty experience under his belt, Marshall is a solid Premier League keeper and would be a good backup for Cech. It would be tough for him to turn down the opportunity of joining an elite club and potential silverware, despite being behind Cech in the pecking order.