Mercer told the club's website: “You only have to look at his record.
“He has played 96 times for Wales and 181 Premier League games, so he's got bags of experience. He is a top-class goalkeeper and a great professional.
“We've done a lot of homework finding out about his background and he is everything you want at a football club.
“He is very supportive if he's not playing, which is vital because we pride ourselves on the team spirit we have here.
“He's a great addition to what we already have as a great group of goalkeepers."
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