22-year-old Swansea City right back Daniel Alfei joins on a season-long loan from the Premier League club.
Evan Horwood, meanwhile, has signed a two-year contract to return to Sixfields after his successful loan spell last season. He is a free agent after leaving Tranmere Rovers.
Added to Tuesday's capture of midfielder John-Joe O'Toole and the business that Wilder did straight after the season end Town can feel more than happy with the squad they take into the new campaign.