Real Madrid have confirmed that Jose Mourinho will leave the club at the end of the current season in Spain.
On-loan Hibernian striker Leigh Griffiths has told parent club Wolves he does not want to return to Molineux.
The 22-year-old, a former France Under-21 international, was given the all clear to switch to the French club following an approach before the transfer deadline.
Gueye, who moved to Goodison Park from Strasbourg in June 2010, has made just six appearances for the Toffees this season.
Brest are currently only four points above the Ligue 1 relegation zone.