Most of the soccer-related words in Japanese are "loan words" from English. But you must be aware that the Japanese pronounce them differently.

geemu
(three syllables as in ge-e-mu)

booru (bo-o-ru)

gooru (go-o-ru)

fauru (fa-u-ru)

riigu (ri-i-gu)

kiipaa
(four syllables as in ki-i-pa-a)

ofusaido
(five syllables as in o-fu-sa-i-do)

toonamento
(six syllables as in to-o-na-me-n-to)