The 25-year-old
A delighted Blues boss Steve Bruce told the club’s official website: “For £50,000, what Damien's done for us he would have to be, pound for pound, one of the best signings I have ever made.
“It's the way he conducts himself, he's a manager's dream.
“He can play left-back, right-back, in the middle, anywhere and he'll give you his all as well.”
Johnson was involved in a fiery World Cup qualifier with his country on Wednesday evening, with Maik Taylor also featuring in the 2-2 draw with
The game also saw fellow Blues star Robbie Savage red-carded for the first time in his career for a clash with Michael Hughes.