A spokeswoman for Mazars said it had drawn up a shortlist of four agencies but declined to comment further on the pitch.
She added that the firm had appointed Firefly Communications to handle its PR in Scotland and City Press to handle PR in Manchester.
Mazars' PR needs are overseen by marketing director Derek Klyhn.
The firm has 5,300 staff and had a turnover of £327m in 2004. It works with around ten per cent of FTSE Euro 100 companies.