Jurgen Klopp's Liverpool side were one game away from setting a new club record of 26 games unbeaten in all competitions but three costly errors from goalkeeper Alisson Becker cost them dear.
Brazil's Alisson has established himself as one of the world's top keepers since arriving at Anfield from Roma for £66 million ($91 million) in 2018.
Alisson's deft header on could be worth millions to his club as it kept alive their late charge for a highly lucrative place in next season's Champions League.
Jurgen Klopp's men would have needed favours from Leicester and Chelsea in their final two games of the campaign had they failed to beat the already relegated Baggies.
Arrivals in Britain from "Red List" countries are subject to 10 days' hotel confinement, which would apply to Brazilian trio Alisson Becker, Roberto Firmino and Fabinho and Portugal forward Diogo Jota.
Brazilian media reported that 57-year-old Jose Agostinho Becker had drowned after going for a swim on his property in the city of Lavras do Sul, in the south of the country.
Year in Review 2020, Biggest Sports Stories: Liverpool become Premier League champions after 30 years
Liverpool's route to becoming league winners started with the appointment of Jurgen Klopp followed by a few shrewd transfers and academy producing scintillating talents.
Premier League: Liverpool goalkeeper Alisson won't return to Brazil in off-season due to coronavirus pandemic
Talking about going back to Brazil in the off-season, Alisson said: "I would not go anyway, even with Liverpool's green light, as it would be a risk for my family."
Premier League: Liverpool manager Jurgen Klopp laments lack of chances at Everton, praises 'world-class' Alisson
On their return after the three-month stoppage due to COVID-19, Liverpool found themselves frustrated by Carlo Ancelotti’s well-drilled Everton side.
Premier League: Liverpool goalkeeper Alisson set to miss ties against Bournemouth, Atletico Madrid due to hip injury
Liverpool goalkeeper Alisson Becker will miss Saturday’s home Premier League game against Bournemouth as well as their Champions League clash against Atletico Madrid after suffering a hip injury this week, manager Jurgen Klopp said on Friday.
FIFA World Cup qualifiers: Neymar back in Brazil squad after missing games last year due to thigh injury
Neymar is back in Brazil's squad after a left thigh injury that sidelined him from the national team at the end of last year. Forwards Vinicius Jr and Rodrygo were, however, left out.
Premier League: Liverpool sway past West Ham after putting in 'normal performance' to stretch unbeaten run
While Liverpool have amassed a whopping 70 points, Moyes’s side sit 17th with 23, outside the relegation zone only on goal difference.
Ligue 1: Kylian Mbappe tops list of estimated transfer values at $296 million according to CIES Football Observatory algorithm
PSG's Neymar holds the record after his 2017 move for 222 million euros, considerably more than the 180 million euros PSG paid Monaco for Mbappe the next year
Lionel Messi marks international comeback from three-month ban with winning goal for Argentina against Brazil in friendly
Lionel Messi struck on his return to international duty on Friday following a three-month ban as Argentina defeated fierce rivals Brazil 1-0 in a friendly in Riyadh.
Paris Saint-Germain's Neymar injured for Brazil's friendlies against Argentina, South Korea next month
Neymar was ruled out for four weeks in mid-October with a hamstring injury he suffered playing for his country in a 1-1 friendly draw against Nigeria.
Premier League: Liverpool's Alisson focused on 'getting back confidence' after returning to training from calf injury
Alisson was carried off in Liverpool's 4-1 victory over Norwich on the opening night of the Premier League season on 9 August.
FIFA Best Player 2019: Lionel Messi pips Cristiano Ronaldo, Virgil Van Dijk to win men's award; Megan Rapinoe clinches women's prize
Lionel Messi won the FIFA Men's Player of the Year award as beaten rival Cristiano Ronaldo stayed away from the star-studded ceremony in Milan's iconic La Scala Opera House on Monday.
Premier League: Liverpool manager Jurgen Klopp laughs off Adrian's mistake against Southampton, says 'no problem as long as we win'
After forwards Sadio Mane and Roberto Firmino put Liverpool 2-0 ahead, new signing Adrian gifted Southampton a lifeline with a poor clearance that rebounded off Danny Ings and into the net.
UEFA Super Cup: Liverpool's Alisson ruled out of Chelsea clash after suffering calf injury in Premier League opener
Alisson Becker suffered a calf injury in Liverpool's 4-1 Premier League opening day win over Norwich City as he slipped trying to play the ball out.
Simon Mignolet was part of the Liverpool squad that claimed the Champions League crown last season and ends a six-year spell at Anfield in which he made more than 200 appearances in all competitions.