Head coach Neil Harris has encouraged his Cambridge United players to embrace the ‘big challenge’ of facing Bolton Wanderers tomorrow evening. The Trotters, who made the eye-catching addition of Aaron Collins from Bristol Rovers in the January transfer window, will arrive at the Cledara Abbey Stadium sitting third in the Sky Bet League One table and firmly in the promotion picture. But following their 2-1 win at Shrewsbury Town on Saturday, the U’s are also in a ‘great place’ having collected 15 points from Harris’ first nine games in charge. And while the boss is well aware of the threats pos…