Everton have also seen an improvement since the arrival of Carlo Ancelotti, but both sides are still well below their expectations at the start of the season.
Watford seemed all but relegated when Pearson arrived in early December, but four Premier League wins from nine matches have allowed them to move within one point of safety.
Having taken 11 points from their last six matches Watford are now looking up, but two losses in their last two games have stunted momentum.
Both sides have made changes in personnel since then, with Troy Deeney returning for Watford and Everton switching to a 4-4-2 under Ancelotti.
While the changes have not brought about instant success, the Italian's side are now well clear of the relegation zone.
Everton's away form remains poor, with the Toffees only managing two wins and nine points on the road this season.
However, in the four league away games since Ancelotti's arrival in December they have taken five points, more than the four Silva managed between August and December.
Watford Premier League form: DWWWDL
Watford form (all competitions): WDWDLL
Everton Premier League form: WWLWDD
Everton form (all competitions): WLLWDD
Hughes and Welbeck are expected to be in the squad, but Ismaila Sarr has been ruled out.
Watford possible starting lineup:
Foster; Mariappa, Dawson, Cathcart, Masina; Doucoure, Capoue, Chalobah; Pereyra, Deeney, Deulofeu
Everton possible starting lineup:
Pickford; Sidibe, Mina, Holgate, Digne; Walcott, Delph, Davies, Bernard; Calvert-Lewin, Kean
We say: Watford 1-0 Everton
Watford are unbeaten at home since Pearson's arrival and should be able to continue that run on Saturday. Everton are better under Ancelotti but remain a work in progress and go into this match as second favourite.