Roeder will also lose Dion Dublin in the summer with the veteran striker set to retire.
"It's a matter of absolute commitment, the board will do everything in its power possible to meet the challenge Glenn will impose on us in the summer," Munby said.
"There are a fair cohort of loan players and some who we know will be leaving the club in the summer - one in particular in Dion.
"They have to be replaced and the whole squad itself needs to be built and enhanced for next season and it's a big challenge."