LONDON, Jan 10 (Reuters) - Struggling Southampton received a shot in the arm on Thursday when their sought-after defender Luke Shaw pledged his long-term future to the club. The 17-year-old had been linked with fellow Premiership clubs Arsenal, Chelsea and Manchester City in recent weeks, and fans of the south coast club were braced for another nurtured starlet to go the way of Gareth Bale, Theo Walcott and Alex Oxlade-Chamberlain into the arms of a big-money club. But Southampton announced the English attacking full-back would be staying with the Saints. ... More...