The former Everton striker is still finding his feet at United, and was handed his first start by Jose Mourinho in the UEFA curtain-raiser.
But he contrived to blaze the ball over from point-blank rage after Keylor Navas had let slip a header.
Romelu Lukaku has a glorious chance to pull one level for Manchester United but blazes his shot over the bar. pic.twitter.com/oYfmfa8rRg— BT Sport Football (@btsportfootball) 8 de agosto de 2017
Lukaku redeemed himself with an explosive rebound finish later on, but he will not be given too many second chances like that in the Premier League this season!