Salah had been waiting to come on before Antonio's goal and was involved in an animated conversation with Klopp, appearing to be angry with his manager.
Williams spoke with the referee after hearing the alleged abuse when he was preparing to take a corner in the first half, and play was held momentarily as supporters were warned.
United, in sixth place in the Premier League, are scrapping for Europa League qualification after dropping out of the race for Champions League places.
"The referee is unbelievable and it's ridiculous. It is difficult to accept," Pochettino said.
A crowd over 65,612 turned up at Gillette Stadium in Foxborough, Massachusetts, the stadium the Revolution share with the NFL's New England Patriots, to see the Argentine World Cup winner.
The win took 15th-placed Everton to 36 points from 35 matches, 11 points ahead of 18th-placed Luton Town
Leverkusen have now scored 16 goals in stoppage time in all competitions this season
Stefano Pioli is close to guaranteeing Milan, in second, a spot in Europe's top club competition in what will almost certainly be his final season at the club
The Bavarians, who saw Bayer Leverkusen end their 11-year-Bundesliga reign by securing the league crown two weeks ago, have only the Champions League trophy to fight for with departing coach Thomas Tuchel eager to leave on a high note.
Bashundhara Kings extended their lead at the top of the Bangladesh Premier League with a 2-0 win over Sheikh Jamal DC as second-placed Mohammedan Sporting Club were held to a goalless draw by Bangladesh Police FC on Saturday.
The single point leaves Liverpool third in the table on 75 points, one behind defending champions Manchester City, who have two games in hand.
Bangladesh Football federation president Kazi Salahuddin has instructed his office to organise the UCB Women’s Football League matches in the evening following heavy criticism over the league’s scheduling.
Arsenal coach Mikel Arteta has been seeking counsel from former manager Arsene Wenger as the club aims to end their 20-year wait for the Premier League title this season, Arteta said ahead of Sunday's trip to Tottenham Hotspur.
Phil Foden issued a warning to Manchester City's title rivals after the champions' "frightening" attack inspired a vital 4-0 demolition of Brighton.
Argentina midfielder Exequiel Palacios wants Lionel Messi to be an eternal part of the national team and cannot bear the thought of playing for his country without the inspirational forward.
Following a 16-month hiatus, the UCB Women’s Football League is set to get underway today at the Birshreshtha Shaheed Mostafa Kamal Stadium with hopes of a competitive tournament, a prospect that seems challenging nonetheless.
Turkish teenager Arda Guler's strike helped Real Madrid close in on the Spanish title with a 1-0 win at Real Sociedad on Friday, moving 14 points clear at the top of La Liga.
Liverpool reached an agreement with Feyenoord on Friday for Arne Slot to succeed Jurgen Klopp as manager, British media reported.