Millwall have been left frustrated by the delays caused by Celtic in the deal to sell Daniel Kelly to the Championship club, according to journalist Pete O’Rourke.
The 18-year-old midfielder has been on the cusp of joining the Championship club this summer after he penned a pre-contractual agreement.
A deal is in place between the two clubs and Kelly underwent a medical and signed a contract with Millwall earlier this week.
However, the Championship club are yet to announce...