He was close to calling in to complain about Agbonlahor, but he decided against it.
The Reds manager has defended ten Hag's side this early on in the season after two defeats from two.
During the game, Agbonlahor described United as "amateur" and "not good enough", as well as saying players like David de Gea and Lisandro Martinez were not good enough.
The week was not a good one for United. We don't remember how good Brentford are. After watching the first half at the training ground, I went home and listened to talkSPORT.
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He lost against us in my first year, so I couldn't remember him as a mentality monster on the pitch, but what he said about Man Utd in that show, I was close to calling in.
If ex players go like this, you can imagine what's happening. In a situation like this, you have to ask yourself how you want to act.
Agbonlahor didn't hold back in his criticism of United, as they were four goals down at the time.
"After this game, I'd be thinking, 'You know what, Ten Hag, just pack up'," he said. They're like strangers on the pitch because he's had pre-season.
Man City wouldn't even give it to Rodri in that position because they don't think he's good enough.
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I would throw the white towel in and say, "Alright, it's four, I can't take any more", if I was Gary.
None of them are working for each other, they're not United. They're not like other people on the field.
In his pre-game press conference ahead of Monday's trip to Old United, Klopp reminded everyone that the Reds lost to their arch-rivals in pre-season.
The public was reminded about the quality of Ten Hag when United ran out easy winners over the Reds in Thailand.
It's hard to play United away. We need to do our best.
Did you say that United had a bad start to the season? I'd rather play United after they won. Is it worse that we drew two games. I'm not sure.
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You can feel the high press idea from the back.
In pre-season, we weren't ready. The quality up front is ridiculous and the quality in the middle of the field is equally as good. I think he is a great player. There is also McTominay.
It is not easy to change a lot of things.