Blues' record signing has not played since limping out of the FA Cup 4th round victory over Wimbledon at St. Andrews on January 24th.
However, Dunn has confirmed that he should return to training today (Friday) and is not ruling out a possible return to the side for the local derby game against the Villa on Sunday.
In his column on the FA's official website, Dunn says: "I can reveal I am on the verge of returning from my injury lay-off.
"I should be back in training on Friday morning, and have an outside chance of being involved in the derby against Aston Villa on Sunday."