Rashford's goal was his first for the club since January, and Ten Hag is predicting more to come, while Sancho has now been able to score against Liverpool, Manchester City, Tottenham.
"I'm convinced they can be really a threat, really a weapon against every opponent. As long as their focus and energy is there with them, it is very difficult to stop them.
So it's about the team getting them in the right situation and also about themselves, with the right approach, right focus in the game and battling, defending, pressing. But also dribbles and combinations and runs in behind."
Manchester United produced a stunning performance to earn their first win of the season against Liverpool at Old Trafford on Monday after losing their first two matches of the season.
Ten Hag will be counting on the duo of Marcus Rashford and Jadon Sancho to find their scoring boots again when Manchester United visits Southampton on Saturday.