Coleman, who recently held meetings with the club's disgruntled fans, has seen his side slip into the bottom half of the table and is keen to stop the rot following four straight defeats.
"I don't know about the players but Friday night is rapidly becoming the biggest game of my life and I hope the players appreciate that," he told the Manchester Evening News.
Dale have shipped 13 goals in their last four games and Coleman admitted big changes are needed in January if they are to save their season.
"I might have to have an overhaul of the squad and move people out," he added. "I haven't got enough quality in defence and I think it would be churlish of me to suggest otherwise, given what's gone on in the last four games.
"I have to live with that until January and then try to go and do something about it. I am not a mug, I have been in this game long enough and I've been through bad times before and come through them and I thoroughly expect to come through them this time.
"I possibly took a bit of a risk by having too many young players defensively at the start of the season and that has probably caught up with us.
"Sometimes you make an educated gamble and it hasn't paid off for me. I have to get it right in January."
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