The striker has been on the transfer list with Ballymena United since December and is rumoured to have agreed a pre-contract deal with Coleraine for next season.
Sky Blues boss David Jeffrey confirmed the Limavady man will move to Carrick on a permanent deal for the rest of this current campaign.
"Cathair was placed on the transfer list in December by the club, was made available to speak to other clubs about a move in January, and at that time Cathair also made it clear that he felt his future lay elsewhere," he told the club website.
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"With no reasonable offers forthcoming, we discussed some loan options with him this past week, when he reported and confirmed with us that he had agreed and signed a pre-contractual agreement to move to Coleraine in the summer.
"One of the clubs who were interested in a loan deal were Carrick Rangers, and Niall Currie asked again today if he would be permitted to speak to Cathair, and they agreed a deal to take Cathair until the end of the season on a full transfer.
"An agreement was struck between the clubs on a fee and so this evening Cathair has signed to play for Carrick.
"Cathair was one of the first players to sign for us, and has been a part of the success created during our time with 70 goals, however, the last couple of season have been affected by injury and form, and with the strength in the squad now both we and Cathair can move forward with football into the next chapter, whatever that holds.
"Going forward we thank him for what he contributed and we wish him all the best."
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