Despite only joining the Premier League team in the summer, Mesa will return to Spain in a loan deal with 'Los Rojiblancos' after failing to make an impact in Wales.
The midfielder has already travelled to Seville to undergo a medical and join up with his new team-mates.
It will be a good opportunity for 28-year-old, who excelled at fellow La Liga club Las Palmas, with Vincenzo Montella's side still in the Champions League.
In fact, if Mesa is included in the squad for their Round of 16 fixtures, he would return to England to take on Manchester United, a club he knows well from his brief stint in the Premier League.
Swansea wished the player luck when announcing the news on twitter, it is unknown if there is a purchase option at the end of the loan.
30 January 2018