A well-taken first goal for the club signalled a moral victory for the striker in that regard.
Tyrone Mings and Callum Wilson will definitely miss the match through injury. However, the Cherries will welcome back Junior Stanislas who has proved to be a thorn in Everton's flesh a few times in the past.
Despite spending most of the first 45 defending, it was Bournemouth who drew first blood three minutes after the restart.
He was the man in the middle for Sevilla's Europa League final victory over Ukranian team Dnipro in 2015 and oversaw Real Madrid's Champions League semi-final second-leg demolition of city rivals Atletico last term.
When Ronald Koeman was given the green light to heavily invest in his Everton squad over the summer, sitting in the relegation zone five games into the season can't have been anticipated. In my opinion, that's ridiculous.
"But I'm realistic, and in football, being realistic is sometimes hard". I don't buy that. I think he still deserves to keep the shirt and that is why the keepers below him - and hopefully I am one of them - have to keep pushing hard to be in a successful England team. I think it's the end of the story.
The win was Everton's third on the spin at home and extended their unbeaten record to a seventh game - a run they would extend to nine before suffering a narrow defeat at Tottenham in the first week of March.
Koeman admitted when Niasse was named in his squads at the start of this campaign that he had earned his place by impressing him with his attitude and his performances for the U23s.
The triumph hands Everton their first league win since the opening day of the season and eases the growing pressure on the expensively assembled Toffees.More news: Facebook To Reveal Funding Behind Political Ads
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They had scored 26 goals in the preceding 10 games, winning six and drawing two.
It is the first time in 11 years the Toffees have failed to score in four consecutive matches in all competitions.
Wayne Rooney could make his 400th Premier League start. His debut, for Everton, was on 17 August 2002.
Though his place in the Everton side was no longer guaranteed, Barry was a very influential figure in the Toffees' dressing room, which is now smarting after a poor run of results in the Premier League and Europe.
Richarlison's late strike means that Paul Clement's side have now lost all three home games this season.
Jermain Defoe's five Premier League goals against Everton have all come at Goodison Park.
Probability of away win: 17%.