Sam Allardyce has admitted he is disappointed by the comments allegedly made about him by Blackburn boss Steve Kean, which emerged this week.
The Scot has become the centre of an internet storm after video footage of him appearing to making disparaging remarks about Rovers predecessor Allardyce was published by a fans' action group.
West Ham boss Allardyce, who is taking legal action against his former assistant, said: "It's disappointing but it's in the hands of my lawyers and they are taking the action that is appropriate under the law of the land."
Kean's role has again come under scrutiny this week, following Rovers' relegation from the Barclays Premier League.
The Scot, the subject of protests from disgruntled fans throughout a dismal season, has been in India for talks with owners Venky's, leading to speculation he may be replaced - but he currently remains in position.
Allardyce is bidding to take their place in the top flight, with West Ham facing Blackpool in the Championship play-off final at Wembley on Saturday.