Martial scored three goals in the pre-season friendlies after returning from his loan spell at Sevilla. The forward looked to be out of favour at the club, but has put himself firmly in the manager's plans for the upcoming campaign. Ten Hag is hoping the Frenchman will shake off the problem quickly.

"It is always difficult to say with these injuries, but hopefully not too long," Dutchman Ten Hag told reporters, adding that fans will have to wait until Sunday to see if Cristiano Ronaldo will play up front.

The Portuguese forward skipped United's pre-season tour to Thailand and Australia and was left out for the team's friendly defeat by Atletico Madrid before playing 45 minutes in their 1-1 draw with Rayo Vallecano last Sunday. Ronaldo's future at United has been the subject of intense speculation after it was reported by the British media that the 37-year-old told the club that he wanted to leave so he can play in the Champions League.

"I'm really happy. We have a top striker. He's here and is in the squad. We stick to the plan," Ten Hag said. "I think we have to look forward to the first game. We want to win every game and we will be trying to do that from Sunday."

Ten Hag said United were still looking to strengthen their squad following the arrival of playmaker Eriksen and defenders Martinez and Tyrell Malacia and would have preferred to finish their transfer business before the season began.

"That would be a good situation, but I'm happy with the squad," Ten Hag said. "I'm happy with the signings until now. We are all working together."

United are looking to improve on their sixth-placed finish in the Premier League last season.