Academy graduate Michael Richens has put pen to paper on a three-year professional deal with Peterborough.
The right-back, 17, who joined from Luton in 2010, impressed Posh boss Darren Ferguson on the club's pre-season training camp in Portugal.
The London Road outfit are now hoping that the youngster will be pushing for a first-team place in the near future.
Ferguson told United's official website: "Michael is a lad who has progressed very well, he has had an excellent pre-season and is a player with potential.
"He is physically strong, probably stronger than others at his age and in Holland he played in midfield as well and impressed, so that is another string to his bow."