Barkley was heavily linked with a move away from Goodison Park in the closing stages of the summer transfer window after he entered into the final 11 months of his contract with the Toffees.
Reports in the British media on Friday claimed that Barkley turned down the chance to move to Chelsea after Everton refused to open talks with his preferred destination Tottenham.
And former Arsenal star Merson admits that he cannot understand why the 23-year-old England international would have turned down a possible move to Stamford Bridge.
Speaking on Sky Sports News on deadline day, Merson said: “I’m lost for words. You’re going to the champions, he’s going to play with Hazard, Willian, and he’s going to play!
“They haven’t got the biggest squad. I’d like to hear the full story, but I’m shocked.”
Chelsea managed to complete two signings on deadline day after bringing in midfielder Danny Drinkwater from Leicester City and also landing Davide Zappacosta from Torino.
The Blues have been busy in the summer transfer window and brought in Willy Caballero, Tiemoue Bakayoko, Antonio Rudiger and Alvaro Morata before their two deadline day signings.
It remains to be seen what will happen with Barkley’s future at Everton. The midfielder has thus far refused to sign a new contract with the Toffees.
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news