Lions sign Kellen Davis, release Jerome Couplin

Going into Sunday's game, the Detroit Lions had to promote Jordan Thompson from the practice squad to add extra depth at tight end. Joseph Fauria and Eric Ebron were banged up, so Brandon Pettigrew was the only healthy tight end prior to Thompson's promotion.

On Sunday, Pettigrew actually suffered an injury of his own, leaving Thompson as the only healthy tight end on the roster. To combat this lack of depth before they depart for London on Monday night, the Lions signed tight end Kellen Davis, who worked out for the team last week. Safety Jerome Couplin was released to make room for Davis.

Davis, who went to Michigan State, joins the Lions after most recently playing for the New York Giants this past offseason. Before that, he was with the Seattle Seahawks in 2013, and he had three catches for 32 yards and a touchdown in 15 games. From 2008-12, Davis played for the Chicago Bears.

It's a bit surprising that Couplin was the odd man out to make room for a fifth tight end. Although he only played eight special teams snaps on Sunday, it seemed like the Lions were quite high on his potential as a safety. Perhaps he will be re-signed after the trip to London when players get healthy at tight end, but I figured a player like Garrett Reynolds would be let go in a situation like this.

In other news, the Lions signed wide receiver Ifeanyi Momah to their practice squad on Monday.