But the panel deemed the offence to be "on the low end of the scale" and Thomas will miss just his region's Magners League game against Glasgow on Friday night, plus the All Blacks game for Wales
Although Thomas started his international career in the back-row, he has proved equally adept in the second-row.
He has played largely at lock for the Ospreys this season, partnering Alun Wyn Jones and replaced Gough against the Blues at Cardiff City Stadium.
Gatland included Thomas in a pool of locks that also included his fellow Osprey Jones, Bradley Davies of the Blues and Newport Gwent Dragon Luke Charteris for the forthcoming Tests against New Zealand, Samoa, Argentina and Australia.
Thomas has won 47 Wales caps, 17 of them as a replacement, and has returned to fitness after groin problems ruled him out of Wales' summer tour to north America.
Thomas, who can play in the back and second-rows, has returned to fitness after groin problems ruled him out of Wales' summer tour to north America.
He has played largely at lock for the Ospreys this season, partnering Jones and replaced Gough at Cardiff City Stadium and has won 47 Wales caps, 17 of them as a replacement.
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