RABAT, Feb 24 (Reuters) - Morocco's Office Cherifien des Phosphates (OCP), the world's largest phosphate exporter, signed a deal with Guinea on Friday to supply the West African country with its phosphate fertiliser requirements.

Large Moroccan companies, including banks and insurers, have been investing aggressively in sub-Saharan Africa. OCP has already signed agreements with other African governments and companies.

OCP will supply Guinea with its entire 2017 phosphate fertiliser needs, estimated at 100,000 tonnes, according to a statement released by the OCP.

Friday's agreement was signed during a visit by Morocco's King Mohammed VI, who has been on a continent-wide tour since last year. Morocco recently rejoined the African Union, a body it left decades again over the Western Sahara dispute.

(Reporting by Samia Errazzouki; editing by Patrick Markey and David Clarke) ((pat.markey@thomsonreuters.com; +213-661-692993; Reuters Messaging: pat.markey.thomsonreuters.com@reuters.net))