The deal had been held up due to the offices required to finalise the paperwork regarding the transfer were closed over the Eid festival.
Business’ opened for trade today after a week long break and Besiktas were able to complete Tore’s paperwork required for the deal to go ahead.
The son of West Ham United chairman Dave Sullivan also confirmed that the deal has gone ahead with a big loan fee.
The loan fee is expected to be in the region of £4-5 million and West Ham will have a £13 million buyout clause option which the initial fee will be subtracted from if the East London outfit push ahead and make his transfer permanent.
Tore has already passed his West Ham medical and signed his paperwork in London last week.
The Turkish international winger is expected to join the West Ham pre-season camp imminently.