West Ham said they were aware of the incident and would work to identify the offender.
Moyes, who took West Ham from the brink of Premier League relegation in the 2019-20 season, said it was a "monumental period" for the London club.
Napoli emerged with a lot of credit from last week's 1-1 draw at the Camp Nou which leaves the tie on a knife-edge.
Dinamo Zagreb sealed a playoff berth in the Europa League knockout stages after a stunning early goal from Mislav Orsic gave them a 1-0 win.
Manchester United's gut-wrenching defeat on penalties by Villarreal in the Europa League final re-emphasised the magnitude of the rebuilding task for Solskjaer.
Arsenal's FA Cup defence was ended by Southampton in the fourth round and the Europa League is their only hope of silverware this season
Spurs and Arsenal were both due to play their last-16 first legs away from home on March 11 and the second legs at home a week later.
Red Star issued an apology to AC Milan and their striker, Zlatan Ibrahimovic for the racist abuse the Swede suffered during Thursday's Europa League match.
Ajax admitted Thursday that they had made a "huge" mistake in failing to register record signing Haller for the remainder of their Europa League campaign.
The Portuguese coach conceded that he is unable to keep all of his players happy.
Mourinho has been handed a suspended one-match European competition ban, UEFA said on Friday.
Kane netted his 200th goal for Tottenham Hotspur as they won 3-1 at Ludogorets and AC Milan’s 24-match unbeaten run
The Gunners aim to bounce back after their poor results in the league, having lost the last two matches to Manchester City and Leicester City.
Sevilla defeated Italian giants Inter Milan 3_2 to clinch the Europa League title for the sixth time in the Spanish club's history.
The Spanish side aim to achieve their sixth title in the competition and keep their habit of winning the title every time they reach the final.
Manchester United reached the Europa League semi-finals as midfielder Bruno Fernandes scored a 95th-minute penalty to secure a 1-0 win over FC Copenhagen after extra time on Monday.
Inter Milan’s Belgium striker Romelu Lukaku scored and tormented the Bayer Leverkusen defence as he led his side into the Europa League semi-finals with a 2-1 win on Monday.
Wolverhampton Wanderers manager Nuno Espirito Santo said on Monday he was pleased with the strong identity the team have forged after working their way up from the second-tier Championship to competing in Europe in the space of three years.
The last eight will be played in four German cities as part of the mini-tournament, with the final on Aug. 21 in Cologne.
Wolves host Olympiakos Piraeus on Thursday in the second leg of their Europa League last-16 tie which is evenly poised at 1-1