Preston had one out and one in last week as Grayson looks to make his squad more competitive.
Sherrif who has not had many opportunities since Grayson arrives has been loaned out to Burton. He was on loan at Rochdale when Grayson arrived and has been unable to break into the side since the start of the season.
Nicholson who has been training for a number of weeks with the first team has now agreed terms with the club. The young right back was without a club and had been at North End for several months keeping up his fitness.
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