Shanahan's comments come just days after Browns coach Mike Pettine said that the team could use a package for Manziel.
"Probably not," Shanahan said on CBS Sports Radio, when asked about seeing a Manziel package of plays. "But that always depends on what you're going against – what the looks are – how everything is going as a whole."
Shanahan said there are some things that Manziel can do and that starter Brian Hoyer can't.
"Johnny is not a wildcat quarterback,” Shanahan said. “If our starting quarterback gets injured or something like that, then your backup quarterback comes in. You hope he can run the offense and execute it."
- Scooby Axson