Everton sacked Roberto Martinez yesterday, after enduring a disappointing season.
The ageing trio all remain a part of Everton’s first-team, but Reid is worried about them having parts to play.
Reid claims that all three of the players are past their best, and any claims that Everton’s current squad is the best in over 30 years are incorrect.
“People talk of this team being potentially the best since the mid-80s but what worries me is Phil Jagielka is coming to the end, as is Gareth Barry, as is Leon Osman,” he said.
“Players such as Stones, Ross Barkley, Romelu Lukaku need to be good players now. Age isn't an excuse.”
Jagielka and Barry are still regarded as integral parts of Everton’s team, and they were played regularly by Roberto Martinez this season.
Thirty-three year old Jagielka has made 29 appearances for the Toffees to date this campaign, while Gareth Barry, who is now 35, has played even more regularly.
Osman was generally used as a substitute by Martinez, but he still featured regularly in Everton’s match day squads.
Everton have badly underperformed this season, and they currently sit in 12th place in the Premier League table.
The Toffees have won just once in their last 10 outings, and their poor run of form has led to Martinez’s losing his job at Goodison Park.