"They are both roughly six-to-eight week injuries," he said.
But then St. Louis also lost another linebacker, Hull, during practice.
"Josh Hull injured his knee," Spagnuolo said. "We won't know until we get an MRI but it might not be good."
The results were not good. Hull tore his ACL and had to be placed on injured reserve.
The rookie from Penn State was a seventh-round pick and was a valuable special teams player.
At the same time the news was coming out about Hull's injury on Wednesday, the Rams were linked to a former New York Giants linebacker.
The Rams picked up Bryan Kehl, 26, off waivers.
The 6-foot-2, 237-pound linebacker was a fourth-round pick by the Giants in 2006 out of BYU. He was also reportedly claimed by the Bears and Jaguars.
Kehl had a blocked punt in the Giants season opener against the Panthers. He becomes the next in a line of former Giants players who have joined former defensive coordinator Spagnuolo in St. Louis, including safeties James Butler and Craig Dahl, defensive tackle Fred Robbins and cornerback Kevin Dockery.
RAMS MAKE ROSTER MOVES
The Rams signed tight end Darcy Johnson after cutting him in training camp. Johnson was one of the five tight ends competing for roster spots during camp but was the only one cut. With Hoomanawanui out for the next few weeks with a high-ankle sprain, it made sense for the Rams to bring back Johnson.
To make room for Johnson, the Rams cut undrafted rookie defensive tackle Jermelle Cudjo from the active roster. Cudjo was reportedly signed to the practice squad after clearing waivers.
Miller, who played linebacker at the University of Illinois, will see some action at fullback, tight end and linebacker for the practice squad. McCoy played running back and fullback with the Rams during training camp.
McCoy was then released, again, to make room for Cudjo on the practice squad.