Will Packwood will be extending his loan spell at Bristol Rovers by two months.
The young defender has impressed during his four appearances for Rovers, picking up the Man of the Match award twice.
Manager John Ward said: “We are delighted that Will is extending his spell with us, he is a good player and he is going to grow into a very good player.
“Will and Tom Parkes have developed a very good partnership together, and they are two very impressive young players, with exciting futures ahead of them.
“This will also buy us more time to get Mark McChrystal the fitness work he needs. Next week he is going to the FA Centre in Burton, and then we will have him back and hopefully get him back up to fitness.”
A product of the Birmingham Academy, American youth international Will Packwood can play in either defence or midfield.
Born in Massachusetts, Packwood has an English father who hails from Solihull and an American mother, therefore has dual US and British nationality.
Having signed a two-year professional contract with Blues in the summer of 2011, he made his first-team breakthrough during the 2012/13 season.
Packwood, 20. signed a one-year contract extension in the summer of 2013.
The new loan spell will run through to the Exeter City game on January 11th.