Former Manchester United goalkeeper Mark Bosnich believes Red Devils fans will be questioning whether the club can make the Premier League's top four this season.
United were beaten 4-1 against rivals Manchester City yesterday and have taken just seven points from their opening five games this season.
And, after being humiliated at the Etihad, Bosnich believes the title may be out of reach for Moyes' side in this campaign.
Speaking on the Alan Brazil Sports Breakfast show, Bosnich said: "They have a lot of thinking to do.
"A performance like that has left all their supporters wondering whether they can get in the top four, let alone challenge for the title."
Two goals from Sergio Aguero, and one each from Samir Nasri and Yaya Toure compounded United's misery against their neighbours.
The Red Devils face Liverpool in the League Cup this Wednesday and will be desperate to get back to winning ways in another crunch rival match.
United then host West Brom in the Premier League next weekend and will be hoping to begin a winning streak after difficult early season games.
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