Swansea lost their keeper on Tuesday night and plumped for the Greek who goes straight into their squad to face Southampton today.
"It's a great opportunity for me,'' said Dimi to Swansea's club website. "I've played at the Liberty Stadium a few times and really enjoyed it.
"The stadium is first class and, from what I remember, the support is superb. It's a big club; a good club.
"I've been out injured for a spell, but now I'm back fully fit and looking forward to challenging for a first team place. It's also a chance to help Swansea out of their resent predicament.''