The Rams placed Robinson on their active/NFI list last month, so he is clearly not healthy enough to return.
Robinson, 24, is a former second-round pick of the Lions back in 2016. He played out the final year of his four-year, $5.234 million contract and was testing the open market as an unrestricted before signing with the Rams.
Los Angeles signed him to a two-year, $17 million contract back in March.
In 2019, Robinson appeared in 13 games for the Lions and recorded 40 tackles, 1.5 sacks, a forced fumble, two recoveries and three pass defenses. Pro Football Focus has him rated as the No. 95 interior defensive lineman out of 114 qualifying players.