Barcoo signed a one-year deal with the Steelers on Wednesday.
The 49ers activated Barcoo from the practice squad COVID list Tuesday before cutting him.
The 49ers placed Barcoo (undisclosed) on the practice squad COVID-19 list Monday.
Barcoo (undisclosed) was waived by the Cardinals after failing a physical.
The Jaguars activated Barcoo from the reserve/COVID-19 list, per the NFL's transaction log.
The Jaguars placed Barcoo on the reserve/COVID-19 list Friday.
Barcoo (coach's decision) is inactive for Sunday's game against the Titans.
Barcoo will start at cornerback in Sunday's game against the Browns, John Reid of The Florida Times-Union reports.