With Forbes on bail for the alleged rape of a 15-year-old girl, along with six other men, his signing is arguably the most controversial in the clubs history.
A statement on MarinersNet read as follows:
"Grimsby Town Football Club have announced that they have signed defender Tyrell Forbes on a weekly basis. The decision is based on football ability and the needs of Grimsby Town Football Club.
Forbes signs up
Allegations in his private life are strenuously denied by the player and his advisers.
It is a fact of life that allegations are made against footballers, who are innocent until proven guilty.
He has relocated to Grimsby and we look forward to him receiving the support the club needs to progress.