I think the main problem was the language barrier and at the best of times it can be hard to put a system or set of tactics across in your native tongue, never mind through a translator!
As an example can anybody tell me what system Man Utd play and how you would set your team out against it? We will say Man Utd play 4-4-2, with the following team.
GK- Van Der Sar
RB- Wes Brown
CB- Vidic
CB- Ferdinand
LB- Evra
RM-Ronaldo
CM- Carrick
CM-Scholes
LM- Nani
CF- Tevez
CF- Rooney
And then put it into spanish!