The Magpies legend was discussing his former side on Match of the Day.
Newcastle United lost 3-0 to Leicester City on Saturday afternoon - the club's eighth defeat in a row - and boss Carver insinuated that Williamson had got himself sent off against the Foxes on purpose.
And Shearer thinks Carver's comments are a real sign he doesn't believe he will be Newcastle manager next season.
With the 50-year-old's absolutely woeful record on Tyneside, neutrals may assume the Magpies boss will be nowhere near the dugout next term. But Carver has remained bullish in recent weeks, telling the press that he is in 'pole position' to keep the job beyond the summer.
Shearer, however, feels Carver's Williamson rant proves he himself no longer believes he will remain at St James' Park.
The Newcastle icon said on BBC football highlights show Match of the Day: “I think John’s thought he’s not going to be manager next season. He’s tried to be as nice as possible to players and it hasn’t worked when he’s stuck up for them week after week.
“To come out and say a player deliberately got sent off, I’m pretty sure will hurt the player. But the players can’t have any complaints, they’ve not been good enough.”