With Sandow confirming on Wednesday he would join the Eels in 2012 on a lucrative four-year deal, the Rabbitohs must find a new player to take on the No.7 jumper.
And Coleman, who made 208 first grade appearances for the Bunnies from 1982-92, believes former NSW representative Finch is the man for the job.
Coleman believes Finch’s experience and leadership are exactly what Souths are lacking.
With youngster Adam Reynolds ruled out for the remainder of the season following a knee reconstruction, Coleman said the Rabbitohs have no choice but to stick with Sandow for 2011.
He felt the club couldn’t afford to prepare for life without Sandow if it would jeopardise their premiership campaign.
“They have to stick with him,” he said.