Aug 4 (Reuters) - Capita said on Friday it expected net exceptional costs of up to 20-25 million pounds ($32 million) related to the cyber incident which rocked the British outsourcing firm in March.

The group, however, retained its full-year earnings outlook.

The company confirmed that some data was "exfiltrated" following the cyber incident and said its probe was close to completion.

"There was minimal operational impact to the majority of

our clients and their customers during the incident," Capita said in a statement.

The company said it aimed to double the operating margin over the medium term, helped by 40 million pounds of cost savings by the end of 2024 after posting a 34% jump in half-yearly adjusted pre-tax profit.

($1 = 0.7862 pounds) (Reporting by Aby Jose Koilparambil in Bengaluru; Editing by Rashmi Aich and Dhanya Ann Thoppil)