Swindon are in negotiations with Celtic pair Simon Ferry and Paul Caddis after the Glasgow giants accepted a revised second bid.
The Clydesdale Bank Premier League outfit recently rejected an offer of around £250,000, but a new deal believed to be in the region of £350,000 including various add-ons has been agreed, although the official figure will be undisclosed.
Midfielder Ferry, who spent last season on loan at the County Ground, and defender Caddis are expected to agree personal terms with the League One promotion hopefuls over the next 24 hours.
They would then be available for Saturday's pre-season friendly against Nottingham Forest ahead of next weekend's season-opener at home to Brighton.
Both players were left out of Celtic's squad for their Champions League qualifier in Braga on Wednesday night, which the Scottish side lost 3-0.
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