Gregory Vignal has joined Scottish club Dundee United it has been confirmed.
The 31-year old French defender has signed a short-term contract with the Terrors, keeping him at Tannadice Park until January 5.
"I have been looking to add a left-sided defender to the squad," Houston said.
"Gregory has plenty of experience and it is important that we add experience to our young squad but first and foremost he is a very good player who will provide extra quality on the left-hand side of the park.
"The length of the contract is ideal for both parties. It will allow Gregory to get a feel for our club and gives us the opportunity to assess Gregory over a longer period."