The pair have been key players since Nigel Pearson took charge in Gameweek 17.
Goalkeeper Foster has conceded just one goal in his four home matches under Watford's new head coach, totalling 28 points.
Deeney, meanwhile, has scored all four of his goals this season during Pearson's eight Gameweeks in charge.
His total of eight clean sheets this season is second only to the nine of Alisson (£6.1m) between the posts. Foster sits just three points off first place in the goalkeeper standings, yet is owned by only 5.0 per cent of managers.
The wing-back looks a standout differential for Sheffield United's visit to Crystal Palace. Stevens sits in less than three per cent of squads, yet his total of 27 chances created ranks third for Chris Wilder's side.
Having recently returned from injury, his delivery can prove decisive for Newcastle United at home against Norwich City. Despite playing just five matches, Ritchie's total of seven successful crosses is the second-most for the Magpies.
The most-bought player in the Gameweek, he has earned a massive 516,000+ new owners for the visit of Southampton. Salah has averaged 8.4 points per home match this season.
A visit from Wolverhampton Wanderers hands him the chance to continue his fine form at Old Trafford. Martial has scored three goals and returned 25 points in Manchester United's last three home outings.
The Watford striker's 10 shots on target over the last six Gameweeks rank joint-top among all players in FPL.
Brighton & Hove Albion's leading goalscorer boasts a major goal threat for his visit to West Ham United. Maupay's 12 shots and five shots on target are league-leading totals among FPL forwards in the last two Gameweeks.
Arsenal's frontman has scored in three of his four Gameweek appearances under Mikel Arteta. Aubameyang also has an excellent record against Burnley, netting seven goals in his four Premier League meetings.
Ash (@FPLHints): I do like Ritchie as a pick due to his set-piece potential. But it remains to be seen if he can keep his place beyond this weekend.
Lee Bonfield (@FPLFamily): The Salah captaincy looks obvious right now, but if you fancy a little bit of a differential, I'm pleased to see Aubameyang back from his suspension and straight into the Scout Selection. Burnley have just one clean sheet in their last six at home, so I'd back Aubameyang to add to their woes.
Sam Bonfield (@FPLFamily): On the back of the midweek EFL Cup victory, Grealish looks a great selection. Salah's record against Southampton makes him the standout captain, particularly with Sadio Mane (£12.3m) expected to miss out. Saints are in good form away from home, though, so I don't see Liverpool running riot.
Neal Thurman (@nealjthurman): With injuries and inconsistency taking their toll in the forward ranks – Jamie Vardy (£9.9m) and Tammy Abraham (£7.7m) specifically – the move to cheap strikers and investing in midfield makes a lot of sense. Maupay is an excellent and productive enabler in this set-up.
Ben Crabtree (@FC_CrabDogg): Many differentials this week makes it an interesting team. I think there's some missed Man City points against a leaky Spurs side.
Ben McNair (@drbenmcnair): I'm not so sure about Martial. Wolves are a tough opponent and Man Utd have struggled all season to break down teams who are disciplined enough to not be caught out on the counter-attack.