The Rams needed a tough, experienced tight end to help get them through while their No. 2 option, Michael Hoomanawanui, recovered from a calf injury.
Spach, already on the Rams' practice field Monday, is that type of tight end. He also played for New England when Rams offensive coordinator Josh McDaniels was there in 2007. That means he'll be familiar with the Rams' offense.
Spach does not project as a regular receiving target, but the Rams do not need one at the position. Rookie Lance Kendricks showed during camp and the preseason he's ready for the role. Spach brings toughness and an edge to the Rams, elements the team sought to add this offseason by signing guard Harvey Dahl, among others.
It's not clear how long Spach will stick around. Hoomanawanui is not expected to practice this week. Spach is a good fit for the Rams in the short term, at least.