The Baggies have suffered from a similar vein of form. Since their impressive victory against local rivals Wolverhampton Wanderers' back in January, the Albion are winless in four, with a solitary point coming against fellow strugglers Fulham.
Spurs' come into the game without main striker Harry Kane, who is still sidelined after coming off injured against Liverpool.
The England captain is joined by both Sergio Reguilon and Giovani Lo Celso on the injury list, while out of favour midfielder Dele Alli is also a doubt.
For the away side, Sam Allardyce is able to give debuts to deadline day signings Ainsley Maitland-Niles and Okay Yokuslu, who both joined the club on loan to bolster the squad.
There could also be a return to the side for Grady Diangana, who has not featured since the start of January.
Tottenham: Lloris, Davies, Dier, Alderweireld, Doherty, Sissoko, Hojbjerg, Bergwijn, Ndombele, Son, Moura
West Brom: Johnstone, Townsend, Bartley, Ajayi, O'Shea, Robinson, Maitland-Niles, Livermore, Phillips, Pereira, Diagne
Ones to watch
Tottenham: Heung-Min Son
With Kane injured, Gareth Bale out of favour, and Carlos Vinicius struggling to adapt to the Tottenham style of play, the responsibility of scoring goals sits on the shoulders of Heung-Min Son.
The South-Korean international has contributed towards 18 goals in 21 Premier League appearances this campaign, scoring 12, and assisting six.
The North London club have struggled to score in recent weeks, with the Lilywhites' finding the net just once in their last three games.
The poor run of form in front of goal is expected to end of Sunday, with Spurs coming up against the worst defensive side in the league. Conceding 52 times already this season, 14 more than Leeds United, West Brom will need to tighten their defensive line if they want to come away from the Tottenham Hotspur Stadium with any points.
Unlike any other Allardyce side, West Brom have struggled with their defensive shape. Switching between a back-four and a back-five under his leadership, the Albion have been exploited for failing to pick-up the spare man in the box, as well as being punished for leaving too much space in behind and between defenders.
Having not found the net in the league since early January, Son will fancy his chances to end his goal drought.
West Brom: Mbaye Diagne
Senegalese striker Mbaye Diagne has aided the West Brom since joining the club on loan from Turkish outfit Galatasaray since joining in January.
A similar striker to both Cenk Tosun and Christian Benteke, who played under Allardyce for Everton and Crystal Palace respectively, the 29-year-old has added a physical presence to the West Brom attacking line.
With an assist under his belt already, the former Club Brugge attacker has the ability to bring other forwards into play, allowing the side to play a more direct style and transition faster through the pitch.
Last time out
The last time the two sides met, a late goal from Kane at the Hawthorns separated the two sides.
The English strikers 150th Premier League goal sent Spurs to second place in the league, whilst the home side retained their place in the relegation zone.
Tottenham have lost just one of their last eight games against the Albion, with the sole West Brom win coming in 2018.
Ahead of the clash, Tottenham manager Mourinho was keen to keep the focus on the upcoming game, and not overlook the challenge of West Brom.
"I want to think about West Bromwich. That’s a big game," said the 58-year-old. "Sometimes big games are just against the top six, or the London derbies or whatever. Other times, big games can be like this. It’s also a big game for West Bromwich because they need a victory, they need points, they need to survive, they need to get out of where they are."
He added: "It’s a big game for us because we need to leave the position where we are, which is not a dramatic position like theirs but is a very bad position for us, we have to leave it, we need to win, we need to break the dynamic of three defeats."
In the away dugout, Allardyce believes that the deadline day signings will boost the confidence of the side, and help them end their winless run.
The former England manager insisted: “The players can look around and have a boost of confidence when looking at the new players because the new players will hopefully add quality and give us a better chance of getting three points."
He continued: “When you have been suffering like we have been suffering for most of the season when someone comes in from another club they don’t have any fears, they play freely and they can lift the whole squad.
“New faces can help lift some of the psychological barriers some of the players may be facing at the moment."
Where to watch
The game is scheduled to kick off at 12:00 BST on February 7 and will be shown on BT Sport 1.