Glasgow Celtic defender Efe Ambrose has put himself in the shop window&nbsp; in the winter transfer market.<br /><br />According to <i>The Sun</i>, Leicester City and Queens Park Rangers will battle each other for the signature of the Nigeria international this month.<br /><br />The relegation - threatened English Premier League clubs are aware of the fact that they have to bolster their ranks or face the prospect of playing in the second - tier next season.<br /><br />Just over a year ago, Efe Ambrose penned a four - year contract extension that ought to keep him at Glasgow Celtic until the summer of 2017.<br /><br />The ex Kaduna United man joined Celtic from MS Ashdod in 2012.<br /><br /><br />