Ferguson is angry at Cole's failure against Hernandez (VIDEO) © EuroFootball.com

Strategist Sir Alex Ferguson was shocked by the mistake of London defender Ashley Cole, which led to the striker Javier Hernandez being sidelined for two weeks.

The incident occurred in Sunday's English championship match, which "Man Utd" won 3-1.

"It was a terrible mistake," Ferguson said. "Cole sometimes acts very recklessly. When you play with all your heart, sometimes the limit is exceeded."

And added, "We don't know how long Hernandez will be out. But most likely it will be a few weeks."

For this episode, Cole was shown a yellow card, but the referee did not award a penalty kick, even though the action took place in the penalty area."