Conversation so far:
who is the longest serving coach in english league
Eddie Howe of AFC Bournemouth is the longest serving coach in the english league.
who is the english league coach who served the second longest
Sean Dyche of Burnley is the second longest serving coach in the english league.
who is the third longest serving coach in the english league
Jurgen Klopp of liverpool is the third longest serving coach in the english league

Question: how many were also players
Self-contained rewrite: how many of the top three longest serving coaches in the english league were former players