The Manchester United boss took exception to the ex-Ajax starlet's bad attitude for the Dutch outfit, resulting in him being binned off to the Belgian side.
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During their time together at the Johan Cruyff Arena, the pair verbally clashed during a game, with Ten Hag refusing to forgive the 23-year-old.
And it appears to be the right call as Lang launched into an X-rated rant to his teammates on Sunday after their 2-2 draw against Cercle Brugge.
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Scott Parker's side, who now sit fourth in the Belgian Pro League, took the lead through Lang in the 18th minute.
But they conceded twice in the second half to go home with a point, with Parker now under huge pressure having won just one out of his nine matches in charge.
Lang was furious in the tunnel after the game, where he called his teammates, 'f****** p******', in a video that has went viral online.
The six-cap Netherlands international also hit out at the defending champions for dropping points, 'every f****** week.'"
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Club Brugge find themselves a whopping 20 points off top spot, while they look set to crash out of the Champions League after the Round of 16 first leg defeat to Benfica.
Fans were quick to comment on Lang's angry outburst, as they insisted Ten Hag was right to part ways with the hothead.
Taking to Twitter, one user posted: "That is the guy ETH dropped off for being a spoiled brat?"
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Another said: "Yeah I don't think any Ajax fan would really want him back despite him being a decent player."
A third added: "Such a bad personality. Got kicked out of Ajax after causing dressing room upset as well. This guy just can't be coached."
Despite Brugge's struggles this season, Lang has still managed to chip in with eight goals and three assists from 26 games in all competitions.
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The forward has previously been linked with moves to Arsenal and Liverpool, while AC Milan have been keen on the player in the past.
More recently, Everton and Leeds are understood to have shown interest ahead of a potential summer transfer.
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