Holland feels Eto'o will now be hard to stop.
He said: "It will be good for Samuel's confidence, it's always good to get off the mark, no matter who you are.
"He was very intelligent with his runs [against Cardiff] and combined very well throughout.
"The goal was one we have seen many times in training but the first time the supporters have seen it in a game. I'm sure that we will now see it again and again because he has that quality.
"He is getting sharper. Class is permanent and you don't have the career he has had without having that class.
"Physically, there is a big difference in this league to the one he was playing in and it has taken time for him to adjust."
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