The Jamaican sprint king is happy to sign for United if they fail to defeat Sunderland on the weekend.
"I have not talked to him (Van Gaal)," said Bolt. "The first game he lost, so I'll give him some time, haha, we'll see if it gets better and Sunday if United lose again, then I will give Van Gaal a bell.
"I just want to try it. I would like a couple of training sessions to see if I'm good enough.
"Hopefully I'll get a chance."
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