Valente blow for Toffees
Gary Naysmith will continue at left back with Valente out, but Italian stopper Alessandro Pistone is continuing his comeback from a cruciate injury after a run-out in the reserves.
'There has been no reaction,' said Moyes after Pistone played 45 minutes in the reserves.
'He is ahead of schedule. Sandro is just finding it a bit of a struggle to get up to speed with the rest of the lads in training at the minute.
'He won't be back in the team next week or anything like that, it will be further down the line when that happens. But I would hope that Sandro would be available for the first team before the end of the season and that's his goal as well.'
Moyes has also missed out on the services of Mikel Arteta in recent games, and he could also miss the weekend clash with Sunderland after returning home for treatment.
'We will wait and see how he is,' said Moyes.
'He went to see his back specialist in Spain and we will know more when he gets back whether he will be available or not.'