Chelsea suffered their first Premier League defeat of the season on Saturday as they were beaten 3-1 by Tottenham.
Jorginho, a summer signing from Napoli, put in arguably his poorest performance in a Chelsea shirt as Spurs constantly pressured him.
The 26-year-old has taken up a holding role under Maurizio Sarri with N’Golo Kante being played further forward.
But while Jorginho has been immaculate in possession before his trip to Wembley, Robson believes Kante should take the position back.
That’s because he believes Jorginho can’t deal when the pressure is put on him as well as Kante.
“In some ways it does (ruin Chelsea’s plan when pressure is put on Jorginho),” Robson said.
“I can’t understand why Sarri likes him so much.
“You’ve got the best holding midfielder in world football in Kante who should be playing there, in my view.
“We saw all the deficiencies of Jorginho against Tottenham.
“Yes he’s had more touches in the Premier League than any other player but that’s against teams that have backed off of him.
“This is the first time anyone has closed him down. This is why I don’t think he’s a top-class player in this position.”
Ian Wright agreed with Robson when he was on Match of the Day.
“It’s been quite confusing to me,” Wright said.
“The best defensive-midfielder in the world – I’m sure he’s got his new contract from what he’s done previously – and listening to his manager say he could score more goals. Well, he’s got midfielders who can score more goals.
“It’s baffling to me.
“You see Jorginho for the second goal go to the ball where Kante would pick up someone like Harry Kane and clear up that mess.
“For the third goal, Kante is upfield and there’s no way he’d allow them through to score that goal.
“It’s baffling to have a player like Kante playing in offensive areas where you’ve got other players who can do that.”