Swansea City have appointed former Sheffield Wednesday boss Carlos Carvalhal on a short-term contract until the end of the season.
The club, who are bottom of the Premier League, confirmed the deal has an option for an extension.
In a statement on their official website, Swansea said Carvalhal agreed the deal on Wednesday and took training on Thursday after meeting his new squad.
Swansea chairman Huw Jenkins said: "We are very pleased with the appointment.
"We felt we needed to get the managerial situation resolved as soon as possible and while the timing is not always perfect, we can look forward to the second half of the campaign with renewed optimism.
"Carlos' time at Sheffield Wednesday, which included securing two consecutive play-off places, highlighted that he has great character and personality to lead the squad and the football club, which is vital at such a crucial time.
"He has built up a lot of experience over the years which will ensure the team is structured and organised.
"He is driven and ambitious and while he has a big challenge ahead of him, I know he will tackle it without fear."
We are delighted to confirm the appointment of Carlos Carvalhal as the club's new manager.
— Swansea City AFC (@SwansOfficial) December 28, 2017
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Swansea parted company with Paul Clement earlier this month after a run of nine defeats in 11 games.
Leon Britton had been in caretaker charge for the last two games against Crystal Palace and Liverpool, with Swansea losing 5-0 at Anfield on Boxing Day, to leave them rooted to the bottom of the table.
Swansea officials were keen to bring in a new manager as soon as possible, with Britton confirming he has no interest in taking the role on full-time.
Carvalhal was in attendance for Swansea's hammering at Liverpool. The Portuguese coach was sacked by Sheffield Wednesday on Christmas Eve, following a defeat to Middlesbrough, after two-and-a-half years in charge at Hillsborough.
The former Sporting Lisbon manager guided Wednesday to the Championship playoffs in his first two seasons in charge, but they struggled to replicate that form in the first half of this campaign.
ESPN FC's Peter O'Rourke contributed to this story.