Nick Kyrgios has withdrawn from the Kooyong Classic due to a foot complaint.

Kyrgios won the first set against Belgium's David Goffin, before retiring hurt trailing 3-2 in the second set after receiving treatment on his foot earlier in the match.

Kygrios apologised to both Goffin and the crowd, but the young Aussie is expected to be fully fit for the Australian Open, which is less than a week away.