#2 - Doubt over James Rodriguez's fitness
James Rodriguez along with Falcao is the most experienced and very valuable player for Colombia. Having single-handedly carried Colombia to the 2014 Quarter-finals, he is a major threat for any opposition team.
Before the start of the tournament there was doubt over his fitness and hence it was a surprise when Colombia included him in the World Cup squad. Having provided a valuable assist and played an influential part in Colombia's 2nd group game against Poland, Rodriguez was substituted after just 30 minutes against Senegal when suffered a calf problem.
Colombia's trio of Cuadrado, Falcao, and Rodriguez make them a formidable team and hence England will breathe a sigh of relief and will have a good chance at beating Colombia if Rodriguez is not declared match fit.