The pair clash in a ten round light-middleweight contest on Saturday 19th October at the Kolding-Hallen Indoor Sports Arena, Denmark.
In his last fight, 32-year-old Pryce (34-13, 18KO) beat Chingford's Michael Lomax at the York Hall and he'll have to produce that form again against 26-year-old Keller.
Pryce said: "I was over the moon when we got the call and now it's all about putting in a performance that reflects the hard work we've put in the gym. I've stayed on it and I was supposed to be boxing last Monday, so the groundwork is down and cemented, we're just sharpening the tools until fight night now.
"I've had a little look of Keller and he's okay. I think he does a bit of everything well but he doesn't really do anything spectacular. There are ways to beat him on the back foot, the front foot and in-between. We've got a game plan for all options, we need to be smart and sharp on the outside and inside."
It took Pryce's trainer and manager Jamie Arthur just two weeks to find his boxer a bout after a challenge for the vacant WBO European light-middleweight title fell through. Arthur has found it difficult to find fights for Pryce in recent months and he's thankful that Keller has stepped up.
Arthur said: "It's been very hard to get Bradley matched because he's seen as very little reward for quite a big risk, that's why we've got a lot of respect for Keller. Bradley is by far Keller's toughest opponent of his career and he's going to have to do something he hasn't yet showed he can do to beat Bradley."
"Bradley has seen just about everything in a boxing ring, whereas Keller is new to professional boxing and there's a lot left to learn. That's why we were surprised to get the opportunity and we'll make the most of it, Bradley will show that he's a level above and he's not coming to lose."
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