Wilkinson told club website: "We have combined youth with experience this window and are pleased with the work we have done, even in these challenging times for the club."
Sullivan continued: "We were determined to keep most of the players from last season and we have done just that and were able to deliver on what we promised.
"5 of our 6 signings are 23 or under and we are confident they can become major players for the club, and they all have a wealth of top fight experience and know what it takes to win football matches.
“They haven’t had much game time together but I am confident that the squad that Al (Taylor) has assembled can challenge on all fronts this season.