Robertson is set to sign a two-year, $9.25 million contract with the Lions, Tom Pelissero of NFL Network reports.
Robertson (concussion) has no injury designation ahead of Sunday's game against Miami, Travis Wingfield of the Dolphins' official site reports.
Robertson is in concussion protocol Wednesday, Vincent Bonsignore of the Las Vegas Review-Journal reports.
Robertson recorded three tackles (two solo) and returned a recovered fumble for a touchdown during Sunday's 32-23 win over the Broncos.
Robertson (hip) is active for Sunday's game against the Bengals, according to Paul Gutierrez of ESPN.com.
Robertson (hip) is inactive for Sunday's game against Kansas City.
Robertson (hip) is doubtful for Sunday's game against Kansas City, Rachel Gossen of the Raiders' official site reports.
Robertson is questionable for Sunday's game against the Bills due to an illness, Paul Gutierrez of ESPN.com reports.
The Raiders selected Robertson in the fourth round of the 2020 NFL Draft, 139th overall.