The 26-year old Partick Thistle midfielder has signed a pre-contract agreement with the Arabs and is excited about making the move to Tannadice Park in the summer.
"I'm looking forward to the challenge," Erskine told the Dundee Courier.
"Obviously it was a hard decision to leave, I've had four years at Thistle and I've loved every second of it.
"I felt it was right for me to move on and try and further my career and I think that's what I'm going to do.
"(Ex-Thistle bosses) Jackie (McNamara) and Simon (Donnelly) are up there and I really enjoyed working with them at Partick. They probably got the best out of me so teaming up with them again is going to be good."