"fancied him" is a correct and usable phrase in written English.
You can use it to describe the feeling of having an attraction or admiration towards someone. For example, "Jane fancied him the moment she saw him."
She had always fancied him, he realised.
He would find out she hadn't much fancied him after she died.
He bought whatever fancied him, from the Ethiopian countryside, from merchants, from markets in England or France or West Africa.
He had the most gorgeous golden curls at that time, like an Adonis, and we all fancied him".
He's a kid playing his fourth Test, but you not only fancied him to bat for a fair bit of time today, you expected him too.
In the closing sprint handicap, I shall give another chance at 16-1 to A Momentofmadness (5.30), having fancied him to cope with the step up to six furlongs at Newmarket last time.
I kind of half-fancied him too, and I thought it would be cool to be in a band...
Hemingway told the CBS Miami he believes his choice of wearing a wool, cream-colored turtleneck sweater, similar to one Ernest fancied, put him over the top this year.
Richardson's current deputy, Diane Denish, has until now been heavily fancied to succeed him to the role when his term runs out in 2010.
We made him admit he sort of fancied her anyway.
Coe had previously been such a fancied contender that London mayor Boris Johnson called him a "first-rate choice" for the role, while the BBC's Robert Peston blogged that Coe was a "virtual shoo-in".
