After leaving Bolton Wanderers at the end of last season, Knight had a brief spell in MLS with the Colorado Rapids, featuring in the club’s final four games of the 2014 campaign before seeing his contract cancelled earlier this month.
Since returning to England, the towering centre-back is now hoping to catch on with the Championship side, and was spotted at Vicarage Road taking in last night's comfortable 3-0 win over Rotherham.
Knight, 34, began his professional career with Fulham, making 155 appearances for the west London club between 2000 and 2007, while earning two England caps in 2005, before making a £3.5 million switch to his local club Aston Villa.
Going on to spend two seasons in the midlands, the Solihull-native then moved on to Bolton Wanderers in 2009, where he made 191 appearances, captaining the side for his final season at the Macron Stadium following the departure of Kevin Davies.
His top-fight pedigree would seem like a good fit in Slavisa Jokanovic’s promoting-hunting but inexperienced side but, after receiving criticism among MLS circles for his performances during his time with the Rapids, it remains to be seen what he could offer over the final 13 games of the season.