Here you'll find a links to the sites where you can download quality football logos in png, eps, ai, cdr, gif, jpg and other formats:
no.1 site, they have thousands of free football vector logos (ai, eps, cdr)
http://www.brandsoftheworld.com/
other sites:
http://www.vector-logos.com/main-en.html
http://www.sportslogos.net/sport.php?id=5
http://kassiesa.com/uefaclubs/
http://www.projectfootball.net/forum/index.php?showtopic=7&pid=342&mode=threaded&start=
http://www.wikipedia.org/ (use search, many logos are in svg vector format which cannot be opened in photoshop, but you can convert them using svg converter on this site http://www.fileformat.info/convert/image/svg2raster.htm )
enjoy
