Rashford returned to the starting XI in the 1-0 defeat to Newcastle after a midweek suspension against Galatasaray but he struggled again and was replaced by Antony in the 61st minute.
The 26-year-old has scored two goals in 18 United games this season and only one from open play against Arsenal on September 3.
"Yes, I know this issue's coming up and Marcus is investing a lot," Ten Hag said.
"We support him and he will return to his form.
"I repeat myself - he works hard and he's investing a lot, he will get back, he will recover and he gets all our support.
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