Manchester United already have goalkeepers like Onana and Bayindir. I do not consider Lammens to be much better than Onana or Bayindir. This is definitely one of the bad decisions of United. Since they did not sign any experienced defender, they definitely needed an experienced goalkeeper.
I just watched Lammens blunder videos from bloggers and I almost cried. The dude makes more costly mistakes than Onana. I didn't understand my mood after watching the video. What really was the problem with the Martinez collapsed deal?
I know bloggers can be funny, but such a compilation is liable to drop the performance of a good goal keeper.
Was Martinez inability to come Manchester united related to Sancho?
Man United also needs to bring in a stronger defender. No matter how good a goalkeeper is if their defense is weak they'll still easily concede goals ultimately making them the scapegoat. What's happening with Onana now is that he's starting to be sidelined, and Man United needs to address this because he's never been able to recover. Essentially no matter how good a goalkeeper is if their defense isn't solid and reliable their performance will worsen and they'll often make blunders.