A win or even a draw against one of the best teams in the league would go a long way in proving that Brighton deserves their spot.
Knockaert was brought down 25 yards out, getting up to curl the free kick over the bar, but three minutes from the break Brighton had a penalty when Eric Bailly fouled Gross as he broke through - and the Brighton man blasted the kick in off De Gea.
Manchester United defeated Leicester City in the first match of the Premier League season. After a second-half cameo against Watford, Jahanbakhsh should start and could cause United some problems.
"They've been weak, United have been weak", Souness said on Sky Sports.
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United have conceded four goals in their opening two games of the season - it took them nine to let in that many last season.
Romelu Lukaku got on the scoresheet for the first time this season, while Paul Pogba converted an injury-time penalty, but the victory was no more than Brighton deserved, with Jose Mourinho's side poor throughout.
Brighton began on the front foot, Solly March's cross cleared by Pogba and then Gross attempting to flick on an Anthony Knockaert delivery only for United to get it away.
De Gea kept 18 clean sheets in the Premier League last season, as he was once again named the club's player of the year and the former Atletico Madrid man is widely recognised as the best goalkeeper in the world.
Mourinho also refused to be drawn on his disappointment with United's summer transfer business, saying: "The window opens on January 1". Will Manchester United come to town and pick up three points? The Portuguese manager referred to Pogba's time in the youth setup at Old Trafford and hinted the 25-year-old could become a permanent captain for the Red Devils in the future. It was a 1-0 win over United here in May that secured their top-flight status last season and this could turn out to be just as significant.