Erik ten Hag suggested Manchester United need more options in attack after their 1-1 draw with Chelsea.
United needed a 94th-minute Casemiro header to secure a point at Stamford Bridge, where they failed to capitalise on their first-half dominance.
Chelsea goalkeeper Kepa Arrizabalaga denied Marcus Rashford twice and Antony shot wide when played through by Bruno Fernandes towards the end of the half.
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United's profligacy almost cost them when Jorginho converted a 97th-minute penalty in a game Ten Hag played Marcus Rashford, Fernandes and Scott McTominay up front.
Anthony Martial has missed 11 of United's 15 games this season and Cristiano Ronaldo was omitted from the matchday squad at Chelsea after refusing to come on in the midweek win over Tottenham.
"It's the fourth game in 10 days and you see, especially with strikers, there's a little bit of lack of freshness," Ten Hag said, "especially in the end also then the power you get a lack of and we didn't score the goals. We already had to score first-half and you make your life easier.
"We had to switch the system that we only faced one time and that was against Sociedad in the first-half. But we didn't make the right decisions on the ball in the second-half. We didn't switch enough and when we came in the final third we were not showing composure and patience, [if we had] then I am sure we will create more chances against this Chelsea but we didn't.
"But I think also we also didn't concede big chances, so that was the good thing and I think a point was a fair result."
United are expected to sign an attacker next year with Ronaldo likely to leave in the winter transfer window or at the end of the season, while Martial has only started twice for the club in the last year.
When Ten Hag was asked if the striker's role was Rashford's best, he replied: "I'm really happy with the energy he's bringing this year in our team. So I'm really happy with his performance every time again.
"He can play in the front, striker, all of the positions. It doesn't matter where."
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