Rooney was forced to miss the Premier League trip to Liverpool at the end of last month and England's World Cup qualifiers against Moldova and Ukraine after suffering a nasty head gash in an accidental training ground collision with Phil Jones.
The 27-year-old posted pictures of the cut on-line to prove his absence was fully justified.
And now Moyes must decide when to bring Rooney back.
"He is in great physical shape," said Moyes.
"Obviously he has a cut right in the middle of his forehead which could split because the skin is very thin.
"But he has had his stitches out and it has knitted.
"We just have to see where the level of risk is with his injury."
Moyes also has doubts over Rafael and Phil Jones, who have hamstring and ankle problems respectively ahead of the clash with Crystal Palace.
However, he does have Marouane Fellaini available following his £27.5million arrival from Everton.