According to Joshua Gleason, Bengals offensive line coach Paul Alexander worked out Midwestern State guard Amini Silatolu with a handful of other NFL offensive line coaches.
Silatolu is considered this draft class' third-best guard after David DeCastro and Cordy Glenn by many draft analysts. According to National Football Post's scouting report, he has as much upside as any guard in this year's draft class and he is a powerful run blocker and a solid pass protector.
He has some technique flaws that needs to be fixed and will need to kick inside at the next level. However, he's a wide-bodied athlete with a powerful/explosive frame, good foot quickness and can really pull from the backside. Might need some time, but is one of the top guards in the class with as much upside as any.
The Bengals are in need of a replacement for Bobbie Williams at right guard and most mock drafts have them addressing the position in the first round by selecting DeCastro or Glenn. If they decide to go another route in the first round though, they could target Silatolu in the second round if he's still available.