Haber said: "It's a dream come true. I'm really excited to be here. I had a trial a couple of years ago and I must have left a good impression - I'm glad we have sorted out a deal now."
"I'm here today at Bramall Lane and I'm very happy about that."
On the capture on the Maltese international, boss Blackwell said: "He's an established international goalkeeper and someone we can have a good look at, at close quarters. We need to carry three senior goalkeepers at this level."