Calhoun was released by the Chiefs on Monday, Aaron Wilson of ProFootballNetwork.com reports.
The Chiefs signed Calhoun to a reserve/future contract Wednesday, Charles Goldman of USA Today Sports reports.
The 49ers released Calhoun on Tuesday, Matt Barrows of The Athletic reports.
Calhoun (knee) is active for Sunday's game against the Jets.
Calhoun (knee) is considered questionable for Week 17.
Calhoun (knee) is inactive for Monday's game against the Bills.
Calhoun (knee) was designated to return from injured reserve Wednesday, Aaron Wilson of the Houston Chronicle reports.
The Patriots placed Calhoun (knee) on injured reserve Saturday, Aaron Wilson of the Houston Chronicle reports.
Calhoun has re-signed with the Patriots, Mike Reiss of ESPN.com reports.