The 28-year-old midfielder picked up his 10th booking of the season during the second half of Tuesday night's 1-1 draw with Carlisle and will begin a two-match ban.
Arnason also suffered a groin injury shortly after his booking and would have been a major doubt for the Dale clash anyway.
Anton Peterlin could be recalled to the starting line-up in his absence after setting up Yannick Bolasie's equaliser with an 84th-minute free-kick.
Defender Karl Duguid looks set to continue at left-back at the expense of Jim Paterson after impressing against the Cumbrians in midweek, while goalkeeper Romain Larrieu will continue to keep David Button on the bench.
Source: PA
Source: PA