The Spurs full-backs were dropped for the Three Lions' 0-0 draw with Slovakia on Monday night in what was a puzzling move by manager Roy Hodgson, given how well the pair - especially Walker - had performed in the first two games.
Hodgson made six changes in total as their Tottenham team-mates Harry and Dele Alli joined them on the bench, but Liverpool legend Fowler admits he cannot understand the decision to omit the jet-heeled defenders.
"Everybody wanted the manager to leave out Raheem Sterling and Harry Kane, who just haven’t been anywhere near their best in the two previous games, so he can hardly be criticised for that," he wrote on Oddschecker.com
"But the decision to switch both full backs was a strange one for me as Danny Rose and Kyle Walker have been two of our best players in the tournament so far."
England successfully progressed from Group B, but they did so in second spot after failing to beat the Slovakians, while Wales thumped Russia 3-0 to win the group.
Whatever happens, Alli and Kane will need to up their games in the knockouts. That Tottenham duo have not been as impressive as their defensive team-mates - or indeed midfielder Eric Dier - and, given their quality, their nation needs them to stand up and be counted.