The 21-year-old, released by Tottenham in the summer, has penned a deal until the end of the season.
Parrett has experience of playing in the Football League after loan spells at Charlton, Yeovil and Swindon.
Sky Sports gets the key details and the opinion of expert pundits in reaction to England's World Cup draw.
December 6, 2013 6:29pm
Stuart Pearce says the 'stifling' humidity of South America is a major World Cup test for England.
December 6, 2013 7:53pm
We take an in-depth look at all the groups for next summer's World Cup in Brazil and pick the star men.
December 6, 2013 8:59pm