Stephen McGinn thinks Brendan Rodgers still needs to bring in another striker at Celtic before the January transfer window slams shut. Celtic have already added to the forward line this month after winger Nicolas Kuhn joined from Rapid Vienna – he was pitchside for the 5-0 win over Buckie Thistle on Sunday in the Scottish Cup. But the name of Lawrence Shankland continues to be thrown about and Stephen McGinn thinks he can take the ‘final step’ of his career by joining Celtic, as he told Go Radio. The 28-year-old is a wanted man, which shouldn’t be a surprise because he is playing the best foot…