The Everton midfielder, 28, has been used sparingly by Roberto Martinez this season, and has been lined up for an exit. His contract expires at the end of this season, and Martinez would prefer to sell him now to make a small profit, rather than lose him for free at the end of the year.
Gibson has played just seven games in all competitions this term, but he has 79 games worth of experience in the Premier League in his career, and is interesting two rival top flight clubs.
Aston Villa and Sunderland are keen to sign him before the end of the transfer window this evening, with the Toffees ready to sanction his departure.
It is not stated as to whether either Villa or Sunderland have yet submitted bids for Gibson, but this deal is surely set to heat up as the hours run down before the end of the window.
Irish international Gibson started his career with Manchester United, spending time out on loan with Royal Antwerp and Wolves, before linking up with Everton in January 2012. He has since played 63 games for the Merseyside club, as well as winning 25 caps for his nation.