Two shops have been gutted by fire in Dandenong this morning.

The damage bill is expected to be in the millions.

The blaze took hold of the two double-storey shops on Lonsdale Street about 1.30am.

Dozens of CFA and MFB trucks were called, and crews brought the blaze under control within about 90 minutes.

No-one was injured.

The cause of the fire is yet to be determined, with police yet to rule out whether it was deliberately lit.