Sheffield Wednesday boss Jones welcomes deal for Arsenal keeper Martinez
The 21-year-old Argentine has made two first team appearances for the Gunners with the second in their 7-5 League Cup win over Reading last October.
Owls boss Dave Jones told BBC Radio Sheffield: "He'll give Chris Kirkland competition and he needs that.
"He played really well in a friendly on Friday and made some great saves. Arsenal think very highly of him."
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