Jarrod Bowen and Mohammed Kudus' second-half goals gave West Ham a 2-0 win over Manchester United in the Premier League's early game on Saturday, as the Hammers briefly moved into the top six.
Hartson, 34, who played 51 times for Wales and for clubs including Arsenal, West Ham United, Coventry City, Wimbledon, Luton Town and Celtic, is facing many months of treatment.
Liverpool snatched three points with a wild 1-0 victory over relegation-threatened Nottingham Forest.
Arsenal's title hopes hit with 2-0 loss to Villa as Man City get boost
Sunderland 5-0 win over Luton Town took the team into the Premier League in Roy Keane's first season as manager.
Liverpool drew 1-1 at third division Luton Town and Newcastle United were goalless at Stoke City in the FA Cup fourth round.
IMAGES from the Premier League match played between Manchester City and Brentford on Tuesday
World Cup qualifiers Portugal were held 1-1 by Northern Ireland.
The sanction has been imposed after Wigan went into administration this month.
Manchester City roared back to the top of the Premier League with a 6-1 thrashing of Bournemouth after Manchester United steadied the ship
IMAGES from Saturday's action in the English Premier League.
Leeds United were crowned champions of the second-tier Championship after third-placed Brentford lost 1-0 at Stoke City in their penultimate game of the season on Saturday.
Luton pulled one back on the half-hour mark when Chelsea keeper Kepa Arrizabalaga failed to keep out Jordan Clark's low effort which squeezed between his hand and leg into the net.
Twenty-year-old Conor Bradley scored his first goal for Liverpool and claimed two assists as Juergen Klopp's team moved five points clear at the top
Manchester City and Arsenal closed in on Premier League leaders Liverpool with contrasting victories on Saturday as Manchester United's bubble was burst by Fulham.
IMAGES from the Premier League matches played on Wednesday.
United stewards ejected the fan, who British media reported had targeted Liverpool defender Trent Alexander-Arnold, in the first half of the game.
'Stars have made stacks of wealth at the cost of the rest of the film industry.'
Dean Henderson arrived at the club from Carlisle United at the age of 14,
Holders Manchester City began their assault on the FA Cup with a 4-1 victory over fourth-tier Port Vale but Manchester United and Wolverhampton Wanderers face an unwanted replay after drawing 0-0 at Molineux on Saturday. Goals from Oleksandr Zinchenko, Sergio Aguero, Taylor Harwood-Bellis and Phil Foden made it a routine day for City, although Tom Pope had equalised for a Vale side sitting 74 places lower in the standings.
Antoine Griezmann and Samuel Lino scored in each half to give Atletico Madrid a 2-0 win over Lazio on Wednesday that secured them top spot in Champions League Group E, the first time since 2016 that they had reached the knockouts as group winners.
Images from the English Premier League matches played on Saturday night.
Mohamed Salah scored a late equaliser from a penalty kick as Liverpool escaped Old Trafford with a single point in a 2-2 draw with Manchester United to climb to even on points with Premier League leaders Arsenal.
Champions Manchester City slipped to a shock first Premier League defeat of the season at Wolverhampton Wanderers on Saturday, while Manchester United's campaign of woe continued with a loss to Crystal Palace.
A summary of Saturday's action in the English Premier League.
Fans return to English grounds, but told not to celebrate goals too much.
IMAGES from Premier League matches played on Saturday.
Images from the football matches played on Tuesday.
Premier League newcomers Watford suffered a League Cup upset in a 1-0 loss at Preston North End while five-times champions Aston Villa overcame plucky Notts County 5-3 after extra-time to reach the third round on Tuesday.
Arsenal became the highest-profile casualties of the FA Cup third round as the 14-time winners lost 1-0 at Nottingham Forest, but Liverpool and Tottenham Hotspur avoided early exits after scares against lower-league sides on Sunday.
Manchester United climb into sixth place with 3-0 West Ham win
Rafa Benitez's much-changed side with a youthful streak had looked set to coast through when Sean Longstaff's deflected shot put them ahead after 56 seconds and Callum Roberts volleyed home a second four years since his only other Newcastle appearance.
Darwin Nunez came off the bench to score twice as Liverpool snatched a sensational 2-1 Premier League win at Newcastle United on Sunday.
Images from the English Premier League matches played over the weekend.
IMAGES from the English Premier League matches played on Saturday.
Ivan Toney, once Brentford's lynchpin in attack, has moved to Al-Ahli for 40 million pounds ($52.50 million).
On a seismic day in the history of Chelsea, Romelu Lukaku scored the winning goal in a 3-2 FA Cup fifth-round victory
News of all that's transpired on and off the football field
Footage showed the Leeds players in an open-top double-decker bus, surrounded by a swarming mass of chanting fans enveloped in smoke from flares and fireworks.
Leicester City said they had a request to postpone Thursday's game against Tottenham Hotspur rejected by the league.