The Liverpool defender has been coasting at club level for some time due to the lack of real competition for his role at Anfield.
The Three Lions play Ecuador and Honduras on June 7 and 10 in America, before they depart for Rio de Janeiro ahead of their World Cup campaign.
Hodgson's side signed off on home soil with a solid 3-0 win against Peru on Friday evening, but one worrying area for the boss would have been Johnson's display.
The Liverpool defender's touch was suspect throughout and his concentration towards his defensive duties appeared to lapse at times.
Part of the problem is Johnson's relative lack of competition for his role.
At Liverpool, like his England career, he is the undisputed number one for the ride side of defence.
Youngster Jon Flanagan and Martin Kelly are the alternatives at Anfield, while Kyle Walker - Johnson's biggest rival - won't be part of the 23-man squad for Brazil, due to injury.
Johnson eventually switched to left-back after John Stones was introduced against Peru, but the Everton youngster is unlikely to be included in the final cut once Hodgson sends the seven-man back-up list home.
Phil Jones and Chris Smalling are the other options in the squad, but neither are totally comfortable in the position, and while Manchester City's James Milner is a willing and versatile operator, it would be a big ask for him to play there.
However, a game for both Manchester United duo Jones and Smalling in the warm-up matches against the South Americans will give the 29-year-old the wake-up call he sorely needs.
He has been coasting for too long.