Jefferson Montero becomes our ninth summer signing.BCFC
The Ecuador international joins on a season loan.
Both clubs submitted all relevant documentation just before yesterday's 5pm transfer deadline.
And today the EFL ratified the move.
Montero, 29, spent the last six months of the previous campaign on loan to West Bromwich Albion.
Pep Clotet commented: "Jefferson is a player who can guarantee crosses and he is dangerous one versus one.
"We need to use him so we maximise these kind of things.
"Jefferson is quick as well and the way he plays, it means we need a lot of focus on the defensive side to make sure you are controlling a game and he is effective.
"So, I see him playing in the front positions and as one of the wingers, using the rest of the team - especially a very flexible midfield - to be able to minimise his weaknesses and maximise his strengths."
The wideman began his career in his home country and Mexico before a breakthrough move to Villarreal in April 2009.
He enjoyed a successful loan spell at Real Betis before switching to Mexico again.
Montero joined Swansea City in July 2014 and made 30 Premier League appearances in his first campaign.
In all, he has appeared 84 times for Swansea, scoring twice.
He has been loaned to Getafe and Emelec, his first team in Ecuador, as well as the Baggies on January deadline day in 2019.
Montero was the provider of two of the three goals against Blues in the 3-3 draw at the Liberty Stadium last season.
Montero's capture is Blues final piece of business this summer.
He is the Club's ninth new signing, following in Gary Gardner, Dan Crowley, Ivan Guzman, Agustin Medina, Jake Clarke-Salter, Ivan Sunjic, Alvaro Gimenez and Fran Villalba.
Clotet added that Blues had targeted Montero during previous transfer windows.