Two Fulham players and their manager were sent-off by the referee in the FA Cup quarter-final clash against Manchester United.
Willian was pictured on Instagram at the Nusr-Et steakhouse in Dubai with celebrity owner Nusret Gokce, more commonly known as "Salt Bae".
Arsenal completed the signing of Willian on a three-year deal on Friday after the Brazilian winger's contract at Chelsea expired.
Chelsea's Willian on Sunday confirmed his departure from the Premier League club with an open letter for his fans saying "time has now come to move on".
Frank Lampard said that Willian has been a great servant for Chelsea, and staying or leaving the club, is the midfielder's decision.
Frank Lampard has led Chelsea to Champions League qualification and will look to round the season up by winning the FA Cup.
Chelsea shrugged off a shock 3-2 defeat at West Ham in midweek with a routine win over Watford at Stamford Bridge.
FA Cup: Chelsea moved into the FA Cup semi-finals as Ross Barkley sealed a 1-0 win at Leicester, while Arsenal joined their London rivals in the last four after a dramatic 2-1 victory against Sheffield United.
Christian Pulisic and Willian scored as the fourth-placed Chelsea beat Manchester City 2-1 on Thursday.
Players like Manchester City's David Silva, Willian at Chelsea, or PSG's Thiago Silva and Edinson Cavani, will be free to leave on July 1 even if the season has not been completed.