According to an Instagram post from the player’s agency New Era Global Sports, it looks like new Everton signing Ashley Williams will switch from his usual number 6 which is worn by Phil Jagielka to number 5. Here is the short video that shows his physical and first day at Everton.
If you’ll notice about half way through this shot appears.
So unless there is some change later on before the official announcement it looks like Williams will wear the number 5. That has him taking the number left just a few days ago by John Stones and previous to that by Samuel Eto’o, John Heitinga and Joleon Lescott. Based on this video I’d expect an official announcement very soon and sales of his jersey to be available soon after.
There is no word as yet if the club stores will allow free jersey name swaps like they did with Ross Barkley and Muhamed Besic who switched numbers in this offseason as well.