The Merseyside club are currently in Sydney for their Down Under pre-season tour and Jagielka was quick to laud his Australian mate who has been a key Toffees player in recent seasons.
''Timmy has been a big player for us for the last three or four years,'' said Jagielka.
''He pops up, the right person at the right time, for very important goals. But it's not only his performances on the pitch, it's off the pitch."
Jagielka also said that Australians should be proud of what Cahill has done for football in this country.
''If you need anything, he's the first person you'll go and speak to, so as a nation you should be proud of Timmy C and we are to have him playing for us," he added.