This site seems to break down all his minutes and goals conceded while he was on the pitch, so working out goals conceded per 90 (just league I’m looking at). Seems the fairest way to look at it instead of just time he has played a certain amount of minutes.
Michael Keane's performance statistics for Everton and national team. Michael Keane is a Defender who have played in 4 matches and scored 0 Goals in the 2025/2026 season of Premier League in England. Other data include Goals per Match, Conceded Goals, Conceded per Match ...
footystats.org
18/19 - 1.12
19/20 - 1.34
20/21 - 1.2
21/22 - 1.68
22/23 - 2.01
23/24 - 2.28
24/25 - 1.38
25/26 - 0.75
His worst spell has unsurprisingly come under Dyche. But the majority of seasons, I’d happily take him as a 4th choice CB.