Nick Hammond has resigned as Celtic's head of football operations, the club have announced.
Hammond leaves after almost two years at Celtic Park, following a successful spell at West Brom and, before that, 20 years with Reading.
The 53-year-old was brought into Celtic initially as a recruitment consultant for the summer 2019 window, in which they signed Christopher Jullien and Mohamed Elyanousi.
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He was then in charge of transfers for January 2020 - when they signed Ismaila Soro - and summer 2020, which included the captures of David Turnbull from Motherwell and Shane Duffy on loan from Brighton, as well as the most recent January window.
A statement on the club's website said: "Celtic Football Club today announced that Head of Football Operations, Nick Hammond, has resigned from his position at the Club to pursue new opportunities.
"Nick joined Celtic in 2019, having previously held Director of Football and Technical Director positions at Reading FC and West Bromwich Albion FC respectively. He leaves with the Club's best wishes."
Celtic chief executive Peter Lawwell added: "We would like to thank Nick for his contribution to Celtic across the past two seasons. Everyone at the Club wishes Nick the very best for the future."