The ex-Southampton manager is not impressed by how long United are taking to decide the Dutchman’s fate.
Strachan believes that United could have been a lot more swift in deciding whether to keep or sack Ten Hag.
He told Prime Casino: "I do find it staggering that his future hasn’t been resolved yet. The FA Cup final was two weeks ago.
"Are Man United waiting for Dan Ashworth to come in and start making decisions?
“Surely that’s not the case and surely he’s having conversations with the club without being officially appointed to the role of Director of Football anyway.
"If the people running the club genuinely don’t think that Erik ten Hag is good enough, then they need to tell him now, because what’s happening at the moment is unfair.
"I also think there’s a point here where Erik ten Hag has to say, 'If you don’t want me here, if you don’t think I’m good enough, then fire me!'"