The former Arsenal star - who now works as a pundit for Sky Sports - has suggested that Son, who can operate as a winger or as a forward, should be starting each and every game for Spurs.
Tottenham will take on Liverpool away from home at Anfield in the Premier League on Sunday evening.
Merson wrote about Son in The Daily Star: “I don’t understand why he doesn’t play every game. He had to come off the bench against Watford but they will need him against Liverpool.
“Spurs don’t have a lot of pace in their team. But he’s got pace to burn. Without him, Spurs on the counter are not going to hurt you really. Harry Kane doesn’t really get away from people, Erik Lamela wants to do a trick, and Dele Alli is the not the player he once was.
“Son is the one. I think he is energetic, enthusiastic and makes things happen. I find it extraordinary when he’s not playing. He never lets you down.”
Son has made six starts and one substitute appearance in the Premier League for Tottenham so far this season, scoring two goals and providing two assists in the process, according to WhoScored.
The 27-year-old South Korea international has made two starts and one substitute appearance in the league for Spurs so far this campaign, scoring three goals in the process, according to WhoScored.
During the 2018-19 campaign, Son scored 12 goals and provided six assists in 23 league starts, and scored four goals and provided one assist in 12 Champions League matches for the North London outfit, according to WhoScored.
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