Rashford was named the Premier League Player of the Month for August.
Ten Hag said: “I'm really happy for him. That tells that Marcus is back on track.
"He is in his middle 20s, he showed in the past in his young career already a lot. Last year was definitely a setback but you see, he's back on that level and I'm really happy and I'm convinced he can score a lot more goals and that he will be a contributor for our team.
"But also, it's a team performance that [allows] Marcus to do that work because they bring him the balls in their cooperation, so it's good to see and it will be a stimulus for both, the manager and the players, [to know] that we are in a good direction so now, [we need to] keep going."