Frank's team lost 5-3 away at Paris Saint-Germain in the Champions League on Wednesday night (26.11.25) following Spurs' chastising 4-1 defeat to bitter local rivals Arsenal in the North London Derby at the Emirates on Sunday (23.11.25).
Frank used two completely different systems in the two games, opting for a back 3 at Arsenal and switch back to a back four and a diamond in midfield against Champions League holders PSG.
Retired defender Vega doesn't think Frank has earned the respect of the Spurs' dressing room yet due to his constant tactical switches.
Appearing on talkSPORT Breakfast, the ex-Tottenham man - who won the League Cup with the club in 1999 - said: "He is changing his mind every two seconds.
"One thing with Ange, whatever you criticise him, he might be limited in his own way, but he had the balls. He stuck to his guns. He did what he wanted.
"The players need this kind of certainty in the dressing room. That's why I think when Ange was winning the Europa League with the young boys, 80 per cent of the season was with the young boys [due to injuries], the dressing room was sticking to him. And you can see that.
"I'm not sure this dressing room is starting to respect Frank because he's changing how they play. They don't know where to go, what to do. They haven't got a strategically stable place to go.
"And the dressing room, as a player, when you know what the coach wants and he's doing it week in, week out, the mentality is there, then the team starts to play well.
"But if you're changing every five minutes, you really, really make the players very insecure. They don't know where to go. And you can see that in these two games.
"If he doesn't control the dressing room, he can be as good as he wants, as nice as he is, but he hasn't got the balls.
"I don't see Frank as suitable for this because I don't think he has the balls. He hasn't got a character to do this."
Despite ending up on the wrong side of an eight-goal thriller in the Champions League, Frank took several positives from the defeat in Paris.
The 52-year-old Danish coach said: "I'm pleased with the performance. It was the reaction I wanted from the players, from the team.
"We've been working very hard on that, the players, the staff, me, to make sure that we responded well and bounced back because that's crucial after a bad performance.
"Today I saw more identity of the team I want to create, we want to create.
"Much more character, personality, aggressiveness. Three words you need to have in any team no matter how you want to do, how you want to play, whatever formation, whatever. Today we saw it, that I'm pleased with.
"Of course, I think it was a performance that was up there where we could get something out of the game, a draw or a win. So, that's a little frustrating thing that we conceded some goals.
"But something to build on. Strikers scoring two goals. The whole team, I think, all performed well."
