Shlemenko checked in at 183.25 pounds, while Cooper tipped the scales slightly heavier at 184.75.
Former Bellator Featherweight Champion Joe Warren was also scheduled to fight on the Bellator 98 card, but has been deemed ineligible to compete by the Mohegan Tribe Department of Athletic Regulation.
No official mention of the cause was noted.
After reviewing the medical documentation submitted by Warren, the now Bellator Bantamweight Semifinalist will have his fight delayed until further notice.
"I've been fortunate to work with one of the best commissioners in the sport in Mike Mazzulli, and after carefully reviewing Joe's medical documents, everyone agreed to err on the side of caution with the goal of ensuring our fighters safety," said Bellator CEO Bjorn Rebney in a statement provided to the media.
"It was determined Joe would be unable to compete this Saturday at Mohegan Sun. Joe's been with us since the beginning and as is the case with every fighter here, it's incumbent on me to ensure Joe is 100% healthy and medically cleared to fight before he steps into the Bellator cage."
With the Bellator Bantamweight Tournament semifinal fight now delayed, Bellator lightweights Patricky Pitbull and Derek Anderson will now be featured on the live broadcast of Bellator MMA from Mohegan Sun live on Spike Saturday, Sept. 7.
The broadcast will begin at 6 p.m. on Spike.com, and the television broadcast will begin at 8 p.m. live on Spike.
Here's a look at the updated Bellator 98 card, with weigh-in results:
Bellator MMA Middleweight Championship
- Alexander Shlemenko (183.25) vs. Brett Cooper (184.75)
Bellator MMA Season 9 Middleweight Tournament Quarterfinals
- Brian Rogers (185) vs. Mikkel Parlo (185)
- Jason Butcher (184.5) vs. Giva Santana (185.5)
- Jeremy Kimball (186) vs. Perry Filkins (186)
- Justin Torrey (185) vs. Brennan Ward (185.25)
- Derek Anderson (154) vs. Patricky Freire (155)
- Jeff Nader (204) vs. Mike Mucitelli (204)
- Andrew Calandrelli (156) vs. Ryan Quinn (155)
- Nick Piedmont (145.5) vs. Matt Bessette (144.75)
- Josh Diekmann (243) vs. Parker Porter (260)
- Glenn Allaire (135) vs. Rico DiSciullo (135.25)