Rashford's return to form could be a major boost for United, who have made an unconvincing start to the league campaign and face a tricky visit to Crystal Palace on Saturday.
And Ten Hag believes Rashford has shown the necessary resilience to bounce back from his setbacks.
"I think every player who plays in the Premier League, but definitely in this club, you need some resilience," he said.
"Not any football career is only the way up, you always go down. You have to deal with it. Marcus Rashford has also experienced, he knows when there are setbacks how to fight back, how to set his career, his performance. He took control of it and I think he is on the way back.
"He started the season very good now he has to continue and to progress.
"It's very good, of course, that your striker... that they're starting to score when the season is very young, strikers need that belief. Now we have a couple of players on the scoring list, it is very good for the team, strengthens their belief, they will go for more goals."
Rashford's problems have also seen him lose his place in the England squad, with the 26-year-old having won the last of his 60 caps as a substitute in a friendly against Brazil in March, although Ten Hag also believes he is now in contention for Lee Carsley's squad next month. "I think he will always be an option for every manager, but it is not up to me," said Ten Hag.
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