Morgan, who joined the Black Cats on loan from Celtic in the Scottish Premiership in the January 2019 - played well in the first half and helped George Honeyman score in the 15th minute.
The 22-year-old winger’s influence on the match dwindled as the game wore on, and Sunderland manager Ross took him off in the 83rd minute.
The Scotland international has made 13 appearances in League One for Sunderland so far this season, providing three assists in the process, according to Transfermarkt.co.uk.
Morgan told The Chronicle about Morgan: “I think he’s shown that in fits and starts since he came down.
"There’s games where he’s done well, and then he’s dipped a little bit, and then there’s parts of games where he’s shown up really well.
“He’s gone quiet at times, but I’ve had faith in him and I thought what he showed on Saturday was bright, positive and energetic.”
Sunderland are aiming for automatic promotion from League One to the Championship at the end of the season.
Ross’s side are third in the league table at the moment with 80 points from 41 matches.
The Black Cats are just two points behind second-placed Barnsley, who have played 42 games, and seven points behind leaders Luton Town, who have also played 42 matches.