I would love to hear your thoughts and insights on he following topic: One of my clients is looking to re-design his website. As a project manager, I was assigned to this task. The thing is I found two designers that made a really good impression, and I consider hiring them both for doing the wireframing and the design. My question is: What is the best way to do this without having them step on each other toes? I obviously wish to maximize the results I'm getting from them and make the collaboration bear fruits. I would love to hear you thoughts and insights on this.

Thanks in advance, ​Lio

One of my clients is looking to re-design his website. As a project manager, I was assigned to this task. I found two designers that made a really good impression, and I consider hiring them both for doing the wireframing and the design. 

What is the best way to do this without having them step on each other toes? I obviously wish to maximize the results I'm getting from them and make the collaboration bear fruits.