The Canberra Times understands Suez increased its offer to workers in a meeting with their union and the Fairwork Commission on Wednesday, as the parties attempt to put to bed the seven-month dispute over the workers' pay rises.

Drivers will vote on Thursday to determine whether they will walk of the job for a fourth time on Friday.

Transport Workers Union ACT sub-branch secretary Klaus Pinkas said negotiations were "close" but another strike wasn't off the cards.

Drivers have called for a 12 per cent rise over the next three years which Suez say is "unreasonable" given the economic impact of coronavirus.

The company's ACT manager, Paul Haslam, argued the Canberra drivers were already among the highest paid in the role across the business.

With drivers on an average pay packet of around $108,000 a year, the 12 per cent boost they were after could see that rise to an average of almost $120,000, if they remained on the same number of overtime hours.

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Suez had counter-offered with an 8.3 per cent deal, which workers knocked-back last week.

It has been one month since the drivers first took action, leaving bins kerbside across scores of suburbs as they tackle Suez for more pay.

If strikes do go ahead on Friday, it is not yet known which or how many suburbs would be affected.

ACT No Waste has operated several free rubbish drop-off points during each strike for impacted residents.