The Blues released McGinn from his professional tryout agreement Wednesday.
McGinn signed a professional tryout agreement with the Blues on Monday.
McGinn scored his second goal in three games during Tuesday's 4-3 shootout loss to the Coyotes.
McGinn (undisclosed) is listed as a healthy scratch for Thursday's game against the Hurricanes, per Alain Poupart of NHL.com.
McGinn (undisclosed) won't be in the lineup for Tuesday's game against the Sabres, Jameson Olive of the Panthers' official site reports.
McGinn (undisclosed) will not suit up Sunday against Montreal.
McGinn will get Thursday night off, as he drops from the lineup against the Flames, Jameson Olive of the Panthers' official site reports.
McGinn logged just 9:42 of ice time in his first game of the 2018-19 campaign, in which he tallied one hit and a minus-1 rating.
The Panthers recalled McGinn from AHL Springfield on Sunday.
McGinn (back) was placed on waivers Thursday, Elliotte Friedman of Sportsnet reports.