Turner is due to arrive at Arsenal until the summer, which will pave the way for Bernd Leno to leave the club then.
The German has slipped down the pecking order at Arsenal and Turner will replace his role in providing competition for current No1, Aaron Ramsdale.
Turner has enjoyed a remarkable rise during his career after going undrafted in 2016. The goalkeeper eventually signed a contract with New England Revolution after impressing on trial and he is now an established USA international, helping his country keep a clean sheet in Thursday night’s 1-0 win over El Salvador.
“Well first of all, I think it is just a great story and I hope the public is aware of this ascent of Matt Turner - because it is an incredible story,” said USMNT coach Gregg Berhalter after the victory.
“He went to Fairfield College, undrafted out of college, and now he’s playing with the national team and he’s headed to Arsenal.
“It’s an amazing story and it’s all down to him, his work ethic, his belief in himself and his never-give-up attitude.
“It’s a great story and Matt is a great guy, a great teammate and we are lucky to have him.
“Tonight was an example where he did everything he had to do. He was calm in all situations. He wasn’t tested much but he was there when we needed him and he looked like a player that’s going to Arsenal, for sure.”