Ronaldo Vieira has been in stunning form for Leeds this season
Vieira has caught the eye with a series of impressive displays in the Championship this season.
The 18-year-old has helped fire Leeds to third in the league table.
It has been a fine breakthrough season for the youngster who has shone under Garry Monk's tutelage.
However, Ritchie believes the Whites could face a battle to prevent him from leaving for the Premier League.
Ronaldo Vieira impressed against Derby last week
Championship stats: Top scorers so far in 2016/17
Thu, January 19, 2017
Express Sport runs through the top scorers in the Championship so far during the 2016/17 campaign
1 of 23
Express Sport runs through the top scorers in the Championship so far in 2016/17
“Everyone was rightly marvelling about the performance of Ronaldo Vieira in Leeds’ televised game with Derby County and the biggest compliment I could say is that it is difficult to believe that he is so young,” Ritchie told the Yorkshire Evening Post.
“I do think that Leeds might have a bit of a problem keeping hold of him if he keeps on going.
"He is so young at 18 and still learning the game and there will be people watching him, no doubt about it.
Ronaldo Vieira has made 22 appearances for Leeds this season
"I think that is also the case with one or two others too.”
Vieira has made 22 appearances for Leeds this season.
The teenager is expected to feature when his side go up against Barnsley at Oakwell this afternoon (5.30pm).