Middlesbrough have sacked manager Aitor Karanka after three and a half years at the club.
Boro are winless in their last 10 Premier League games and currently sit in the relegation zone, three points from safety with 11 games remaining.
They are also the league’s lowest scorers with just 19 goals and were knocked out of the FA Cup by Manchester City last weekend.
Assistant head coach Steve Agnew will take control of the first team.
“This club will always hold a special place for me,” said Karanka, 43.
“I’d like to thank Middlesbrough for a wonderful opportunity and the players, staff and all the people at the club who I have worked with.”
The former Real Madrid assistant manager took over at the Riverside in November 2013 to become Middlesbrough’s first ever non-British boss.
Boro secured automatic promotion to the Premier League last season.
The club met with Karanka and following discussions, Boro said it was in their “best interests” to make the change.
Boro had a solid start to the season including a 1-1 draw at Manchester City, but their form dipped over the winter and without a win since 17 December, they dropped into the relegation zone on 4 March for the first time.
Goals have been hard to come by, despite the £7m signing of Aston Villa striker Rudy Gestede in January and they have scored just three goals in their last 10 league games.
Boro spent over £20m in the summer, as they brought in midfielder Marten De Roon for £12m, along with wingers Adama Traore for £7m and Viktor Fischer for £3.8m.
They also signed former Manchester City striker Alvaro Negredo on a season-long loan from Spanish side Valencia.