The Portuguese admitted that Eto'o's ability in front of goal led to him being picked ahead of Torres who has vastly different attributes.
"I had a strong team physically, the people at the back and David [Luiz] in front of them," he told Sky Sports. "And then I had the creative players and I wanted the movement around the box.
"Some of Samuel's quality around the box, and Fernando is more about pace, about power and space, I was feeling today that United was trying to be compact and press us.
"I needed a player like Samuel and he works well for us, the same as Fernando."
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