Roberto Martinez is refusing to let David Moyes' return to Everton with Manchester United distract his side from the race for the top four.
Moyes spent 11 years as Everton boss between 2002 and 2013, in which time he led the club to the UEFA Champions League qualifying rounds and an FA Cup final appearance, and returns to Goodison Park for the first time on Sunday.
But with Everton aiming to qualify for Europe's premier club competition for the first time since 2005, Martinez is calling on his side to concentrate on the job in hand.
"David Moyes had an incredible past with our football club and that's always going to be in everyone's mind, but I think that the game is so important," he said.
"The three points are very significant for both clubs. Once the whistle goes, that is going to be the main focus."
Moyes has endured a frustrating first campaign as Alex Ferguson's successor at Old Trafford, with United on course for their worst Premier League placing, having previously never finished outside the top three.
Juan Mata arrived from Chelsea in January in a bid to revive the club's flagging fortunes, and the Spaniard has backed his new manager to turn things around next term.
"I have no doubt about it," he is quoted as saying in The Daily Mirror .
"When I joined, in all my conversations with the board and the manager about next season, they were confident about getting the right players.
"I'm sure this club is going to come back and fight for every trophy. Since I was a kid, Manchester United was fighting for everything, and this moment is going to come back for sure."
United come into the game in seventh, nine points behind their fifth-placed opponents, with Everton fans enjoying a fine season under Martinez.
Everton have enjoyed a resurgence under Martinez that has seen them pick up impressive home wins over Chelsea and Arsenal, while a 1-0 triumph at Old Trafford earlier in the season highlighted the advances they have made with the Spaniard.
Wednesday's surprise 3-2 home defeat to Crystal Palace left them one point behind Arsene Wenger's men with four games to go, and they will continue to be without Steven Pienaar (knee) on Sunday, while Phil Jagielka (hamstring) could be fit enough for a place on the bench.
Robin van Persie will once again be missing for United due to a knee injury, but former Everton pair Wayne Rooney (toe) and Marouane Fellaini (knock) are expected to feature.
|Coach: Roberto Martínez|
for S. Distin 46'
for R. Barkley 70'
for K. Mirallas 90+4'
|Warm Dortmund welcome delights Tuchel|
|Silva vows to fight for Madrid place|
|Mancini hints at Shaqiri and Santon departures|
|Bojan raring to go after return from injury|
|Babel backs Firmino to shine at Liverpool|
|Falcao must wait to impress, warns Chelsea favourite|
|Bartomeu: Deal in place for Turan|
|Parejo re-signs with Valencia|
|MLS Review: Sounders return to winning ways|
|Klinsmann unhappy with USA performance|
|High hopes for Paraguay - Diaz|
|Gareca: More to come from Peru|
|Gerrard had European offers|
|Argentina out to spoil Chile´s party - Martino|
|Sampaoli: Chile won´t change style|
|Di Maria will come good at United - Rojo|
|Peru 2 Paraguay 0: Gareca´s men finish third at Copa|
|United States 4 Guatemala 0: Klinsmann´s men win comfortably|
|´I’d prefer no-one to know my name´ - Bassett|
|Matthews completes Sunderland move|
|Podolski set for Galatasaray medical|
|Gundogan inspires Dortmund victory|
|Inter confirm Montoya capture|
|Murillo joins Inter, as Kuzmanovic and Obi depart|
|Falcao signing not a risk, says former Chelsea star|
|Deeney agrees new Watford deal|
|Confidence and service the key to Falcao success at Chelsea|
|No bids for ´Chelsea target´ Baba, claim Augsburg|
|Derby swoop for Ince|
|Fiorentina consider legal action over Salah ´no-show´|
|Chelsea the team to beat in the Premier League, says Neville|
|Storari exits Juve for Cagliari|
|UEFA removes FFP restrictions on Man City and PSG|
|West Brom hope for new owners within the month|
|Chelsea agree loan deal for Falcao|
|Kuyt eyes trophies on Feyenoord return|
|Chile v Argentina: History beckons ahead of Copa America final|
|Wallace extends Monaco loan|
|Mihajlovic wants to instill fear factor at Milan|
|Mignolet improving at Liverpool - Grobbelaar|
|Mumbai City name Anelka player-manager|
|Olivia the parrot predicts Japan to win Women´s World Cup|
|Lusitans coach blasts Bilic´s ´lack of respect´|
|Sakho eyes more Europa League wins|
|Gareca wants Peru to keep building|
|Chile ´no chance´ if Argentina produce their best - Diaz|
|Ocampos joins Marseille permanently|
|Europa League Review: Cloud-nine Brondby ignite opening round|
|West Ham 3 Lusitans 0: Sakho nets twice at start of Europa League journey|
|Holebas makes Watford move|
|Milan secure Adriano signing|
|Peru v Paraguay: Diaz counts cost of semi-final loss|
|Bastia hit out at reports of extra debt|
|Hernandez has successful surgery|
|Odemwingie signs one-year Stoke extension|
|Uth signs for Hoffenheim|
|Henen seals Everton return|
|Cattermole pens long-term Sunderland deal|
|United States v Guatemala: Klinsmann backs Dempsey ahead of Gold Cup warm-up|
|West Ham working on Jenkinson return - Gold|
|Milan agree deal for Bacca|
|Real buy back Vazquez from Espanyol|
|Richards leaves Swansea for Fulham|
|McShane signs for Reading|
|Giggs tells youngsters to seize US chance|
|Hammond pens Leicester extension|
|Only Schweinsteiger can decide Bayern future - Guardiola|
|Cech plans to play until he´s 40|
|Montoya arrives in Milan ahead of Inter move|
|Hernandez out of Gold Cup|
|US asks Switzerland to extradite seven FIFA officials|
|MLS Preview: Sounders seek momentum switch|
|Mexico 0 Honduras 0: Hernandez injury sours friendly|
|Hernandez taken to hospital|
|Garay in doubt for Copa America final|
|Wambach: USA peaking for World Cup final|
|Bassett ´an absolute hero´ despite own goal - Sampson|
|Japan 2 England 1: Late own goal breaks English hearts|
|Salvo quits as Valencia president|
|Costa not Ribery cover - Bayern director Sammer|