West Ham are due to take on Watford at Vicarage Road tomorrow, in what will be Moyes’ first match in charge.
And the Scottish boss immediately has a selection problem, as his options at centre-back look short.
Reid has been away on international duty with New Zealand, and played in a World Cup qualifying match against Peru on Wednesday night.
Reid only returned to England yesterday, but Moyes admits that he may have to play the 29-year-old, against his wishes.
“Winston Reid will be the last one back today and in a perfect world we maybe wouldn’t use him on Sunday,” Moyes said.
“We’re a bit short in central defence so we’ll see how he is.”
Moyes is under pressure to spark an improvement at West Ham, as the Hammers are in big trouble.
Slaven Bilic has left the London side sitting in 18th place in the Premier League table, and the Hammers need to start finding the winning formula soon, if they are to move away from the relegation zone.