Joe Edwards has won four of his 19 matches in charge of Millwall
Former Millwall boss Neil Harris is set to replace Joe Edwards as head coach, BBC Radio London understands.
The Lions have lost their last four Championship games, leaving them one point above the drop zone.
Edwards, 37, joined the club in November as successor to Gary Rowett for his first job in senior management.
Harris, 46, spent four years as Millwall manager from 2015 until 2019 and is currently boss of League One side Cambridge United.
Former Chelsea and Everton assistant coach Edwards has only won four of his 19 matches in charge, and they suffered a 2-0 home defeat by fellow strugglers Sheffield Wednesday on Saturday.
It is understood Millwall are in negotiations with Cambridge to bring club legend Harris back to The Den, despite him only taking charge of the U’s in December.
Harris is Millwall’s all-time leading goalscorer having scored 138 times in 431 appearances for the Lions.
Millwall are 21st in the Championship, one point above London rivals QPR, and in danger of dropping into League One for the first time since 2015.
Harris’ first match in charge could be Saturday’s trip to automatic promotion-chasers Southampton.
If he takes the role he will have managed in all three tiers of the EFL this season, having started the campaign at League Two Gillingham.