They would have to do some real cap magic to keep both. They currently have 2 million in cap room, even after jetting Hartline and Gibson. And that's before draft picks I believe. I can't see Suh going for less than $10M plus signing bonus and probably a good bit more than Mario.
Not counting Clay (who they just tagged), here's who they'd safe between 4.5-7.5M in cap space pre June 1st: Cameron Wake, Ellerbe, Reshad Jones, Mike Pouncey, Earl Mitchell, Randy Starks.
Getting both Suh and Odrick would probably mean cutting 3 of those guys at best, maybe up to 5.