The Baggies currently sit 19th in the Premier League table, 9 points adrift of safety with only 12 games remaining.
Despite being on a slight unbeaten run, Sam Allardyce's side have only won one of the last eight games which came last time out at home to Brighton & Hove Albion.
Meanwhile, Everton are still well in the hunt for a top-four finish as they are positioned in seventh place only two points behind the Champions League places and they have a game in hand on all of the teams above them.
Not only will the difference in league positions give the visitors confidence going into this one, but the fact that they are unbeaten in their five Premier games at the Hawthorns with their last defeat there coming all the way back in September 2012.
For the hosts, winger Robert Snodgrass is set to return following a knee injury that left him unavailable for the Burnley and Brighton clashes.
Meanwhile, Semi Ajayi is available for selection once again after returning from his suspension after being sent off in the goalless draw at Burnley.
The only confirmed absentee for West Brom is full-back Kieran Gibbs who is suffering with a neck and shoulder problem.
Whereas the away side have a number of doubts that must be looked at prior to the visit to the Hawthorns.
Midfielders James Rodriguez, Tom Davies and full-back Seamus Coleman all failed to feature in Monday night's victory at home to Southampton.
During that game, Allan played the full 90 minutes in his first game since mid-December, so his recovery will have to be assessed before deciding on how long he will play for.
The only confirmed players that are certain to be unavailable for selection for the Toffees are Yerry Mina, Fabian Delph and Jean Phillipe Gbamin.
Ones to watch
Kyle Bartley- West Brom
It has been a disappointing season defensively so far for West Brom considering that they have conceded an almighty 55 goals, meaning that they obtain the worst defensive record in the league.
However, the blame for this cannot be put down to Kyle Bartley who in his 16 starts and two substitute appearances in the league has been an impressive force at the back for the Baggies.
If Everton hope to get past the 29-year-old it would be best if they played in between the lines instead of putting crosses high into the box due to his good ability in the air.
Throughout the campaign, Bartley has also shown to be brave and do whatever he must to stop the ball from going into his net shown by him on average making 0.8 tackles and 1.1 blocks per game.
Dominic Calvert-Lewin- Everton
The 23-year-old has been in blistering goalscoring form for the Toffees this season after bagging 13 goals in the 22 league games that he has played.
He has really hit his stride since Carlo Ancelotti was appointed as manager in December 2019 and with the vast amount of goals that the Baggies have conceded this season, the England international will see this as an opportunity to add to his tally.
The best thing about the striker is that he scores all kind of goals shown by him scoring seven right-footed shots, four headers and one left-footed shot.
This is something that will concern West Brom's backline as the fact that he has the ability to score all kind of goals makes him unpredictable.
Everton have been in great recent form against West Brom as they are unbeaten in five games against the Baggies with their last defeat coming in February 2016 when a Salomon Rondon strike was enough to see them win 1-0 at Goodison Park.
In the reverse fixture, the Toffees smashed the side managed by Slaven Bilic at the time 5-2 with a hat trick by Calvert- Lewin and a strike on the stroke of half time by Rodriguez easing them to a comfortable victory.
In fact, Everton have only lost twice against tomorrow's opponents in the last 13 games which in itself will give the side confidence against an out of form and struggling West Brom side.
What the managers have said
Sam Allardyce: "The game against Everton will be a big test for us and I think we will have to match the Man United performance to get a result against them.
Carlo Ancelotti: "West Brom in this moment is playing like Allardyce once: strong defensively, good organisation. It's not a coincidence that in the last two games they didn't concede a goal."
West Bromwich Albion:
Johnstone; Furlong, O'Shea, Bartley, Townsend; Livermore, Sawyers; Phillips, Pereira, Diangana; Diagne
Pickford; Coleman, Keane, Godfrey, Digne; Doucoure, Davies; Iwobi, Rodriguez, Richarlison; Calvert-Lewin
Where to watch on TV
The encounter which kicks off at 6 pm at the Hawthorns tomorrow night is being live-streamed on Sky Sports Main Event and Sky Sports Premier League.