#6 Rezar

Rezar, one-half of the Authors of Pain, is also currently on the shelf, having picked up an injury before WWE WrestleMania 36. The torn right bicep keeping Rezar out of action was caused by a crossbody from Montez Ford on an episode of RAW in March. With Rezar out, his tag-team partner Akam is also off television.
According to reports, Rezard has undergone surgery and is on the road to recovery. At the time, it was reported that he would be out for 7-8 months, meaning that he could be back at the very end of 2020 at the earliest.
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#5 Elias

Elias is one of the latest on this list to join the injured list. WWE wrote him off television as part of the Jeff Hardy DUI angle. Elias was suffering from a torn pectoral muscle and has since reportedly undergone surgery.
The injury turned out to be worse than previously assumed and it's unclear how long Elias will be out of action but it's unlikely that we will see him back in WWE until the end of the year at the earliest.