Burnley have completed the signing of Celtic left-back Danny Fox for an undisclosed fee on a three-and-and-a-half year contract.The 23-year-old made his Scotland debut in November having previously played for England Under-21s. [LNB]He signed a four-and-a-half-year contract with Celtic in July after leaving Coventry for an undisclosed fee, thought to be about £1.5m. [LNB]Burnley are believed to have offered Celtic £1.8m for Fox. [LNB]He was one of two defenders to leave Celtic Park on Friday, with captain and fellow Scotland international Stephen McManus moving to Middlesbrough on loan. [LNB]Celtic manager Tony Mowbray has signed two central defenders during the January transfer window, Jos Hooiveld arriving from AIK Stockholm for about £2m and Thomas Rogne from Stabaek.[LNB] MY SPORT: DEBATE Give your reaction to the exits from Celtic But Lee Naylor is once again Celtic's most experienced left-back, with right-backs Mark Wilson and Paul Caddis, plus central defender Darren O'Dea, providing cover. [LNB]Former Everton trainee Fox played more than 100 games for Walsall between 2005 and 2008 before a successful 18-month spell with Coventry attracted the attentions of the Glasgow club. [LNB]Fox started 22 games for the Scottish club but had recently found his first-team opportunities limited under Mowbray. [LNB]He will not be involved in Saturday's Premier League match against Chelsea at Turf Moor. [LNB]New Burnley manager Brian Laws also signed central defender Leon Cort from Premier League rivals Stoke City for £1.5m on Wednesday. [LNB]He has also added goalkeeper Nicky Weaver to his squad after his short-term contract with Dundee United came to an end.