Had Phil Jones glanced at his fellow substitutes at the Anoeta Stadium in San Sebastian on Tuesday, he would have maybe noticed his new-found status within the Manchester United squad.
Sitting pretty at the top of Group A in the Champions League, United could afford to slip in Spain. Meanwhile, after three defeats and two draws from their first 10 games, there's no more margin for error in the Premier League.
With that in mind, Moyes left Robin van Persie on the bench against Sociedad to keep him fresh for when his former team-mates roll into town. It took him three minutes to score against his old team at Old Trafford last season, and Moyes could do with a similarly quick start on Sunday.
The other name left off the team sheet on Tuesday was Jones.
Fellaini got the nod in northern Spain, in what was his first start for almost a month. The Belgian began to look comfortable in a United shirt for the first time until he was sent off in the final minutes for committing one foul too many.
Fellaini's performance has put him in contention for a place in the team to play Arsenal, especially if Moyes decides to combat Arsene Wenger's five-man midfield with five of his own.
In any case, fit and rested, Jones is in pole position to resume his own midfield duties.
Moyes favoured his mobility and energy over Fellaini's physical presence against Fulham, and those qualities will be even more important against Arsenal's impish playmakers.
Jones and Michael Carrick—should he recover from an Achilles injury in time—will be tasked with stopping Arsenal's front four from supplying Olivier Giroud.
Should Jones start ahead of Fellaini against Arsenal, it would represent a new order in United's midfield.
Moyes searched all summer for a midfield partner for Carrick. The man he was after might have been there the whole time.