Watford boss Sean Dyche has appointed Ian Woan as his assistant manager and Tony Loughlan first-team coach.
Woan leaves his job as Portsmouth first-team coach while Loughlan has been out of work since exiting Ipswich Town in January.
The trio were briefly together as players for Nottingham Forest in 1990.
The news comes after the from Vicarage Road to join Malky Mackay's staff at Cardiff.
Woan, 43, a former Forest, Swindon and Shrewsbury winger, was made Pompey under-18s coach in July 2007 and became first-team coach upon Cotterill's arrival three years later.
Ex-Kettering and Lincoln midfielder Loughlan, 41, has coached under Roy Keane at both Sunderland and Ipswich.