Despite the dwindling results, Frank believes that the growing criticism aimed at Ten Hag is unwarranted.
"It's incredible how much scrutiny he's had to face," he said. "As a head coach, I acknowledge how it feels to be in a situation like this. I think [the criticism] is too much. He's clearly a good coach, he's won two trophies in two seasons.
"But I understand how it is: if the team wins, the head coach is absolutely fantastic; if the team loses, the head coach is absolutely sh*t! Whereas it's probably somewhere in between. It's never only the head coach, or the players, or the fans, or the board - it's a combination of all of these things."