The 22-year-old has been at Manchester United since 2008 when he joined from Roma but has yet to make a senior appearance for the club.
Signed when he was just 16 following a contract dispute with Roma, Petrucci has had two other loan spells away from Old Trafford. He joined Peterborough United last season and made four appearances for Darren Ferguson's side scoring one goal. He was then sent to Royal Antwerp in Belgium at the start of this season before being recalled in January.
For someone who has been on the books at Manchester United for five-and-a-half years it is surprising that he has never been given a chance in the first-team, not even in the cup competitions.
They must obviously rate him or else they wouldn't have kept him on this long. He now joins Charlton Athletic who themselves are in a relegation battle, and Petrucci will be expected to get stuck in and battle hard.
Players such as Adnan Januzaj and Danny Welbeck were handed their chances at much younger ages than Petrucci, so he should knuckle down and do all he can at Charlton so he can impress potential suitors as well.
It could represent his last chance to impress his parent club, as I doubt they will keep him much longer especially with the club expected to splash the cash to improve the squad in the summer.
Midfield is certainly an area they are expected to improve so Petrucci's chance may be even more unlikely to arrive.