Scottish giants Glasgow Celtic want to strengthen their defense in the January transfer window.&nbsp; <br /><br />Efe Ambrose has been named in Nigeria's provisional African Cup of Nations roster. According to the <i>Scottish Daily Record,</i>&nbsp; to fill the gap created by Efe's absence, <span style="">coach Neil Lennon has beamed his searchlight on </span><span style="">24 - year - old Israel international Rami Gershon, who plays for Standard Liege.<br /><br />''We are looking at adding one or two players to strengthen the squad,'' Lennon told </span><span style=""><a href="http://www.dailyrecord.co.uk/all-about/celtic%20fc">dailyrecord.co.uk</a><br /><br />Presumably, Ambrose will miss games in the SPL against Heart of Midlothian, Kilmarnock and Inverness CT if Nigeria qualifies for the semi-finals of the African Cup of Nations.<br /><br />A summer arrival from MS Ashdod, Ambrose has since played 15 games (1 goal) for the SPL champions.<br /><br /><br /><br /></span>