Klich began his career in his homeland at Cracovia before making a switch to Bundesliga club Wolfsburg in 2011. He then joined Kaiserslautern in 2015, after being sent out on loan by Wolfsburg on two occasions.
Leeds fans have taken to Twitter to welcome new signing Mateusz Klich to the club.
The 27-year-old central midfielder has put pen-to-paper on a three-year deal, and he arrives from FC Twente for an undisclosed fee.
The Yorkshire giants announced the news on their official website and on their official Twitter account on Friday morning.
?? #LUFC have agreed the transfer of @cli5hy from FC Twente for an undisclosed fee. Read more at https://t.co/tW2CrSqcbh pic.twitter.com/5sUlrFtc3s
— Leeds United (@LUFC) June 23, 2017
Klich becomes Whites manager Thomas Christiansen’s first signing of the summer.
The confirmation comes after Sky Sports claimed on their website that the 27-year-old was set to undergo a medical at Elland Road on Thursday.
He was a mainstay of Twente’s midfield last term, as he made 30 appearances in all competitions, which yielded six goals and four assists.
The 27-year-old joined the Dutch outfit from FC Kaiserslautern last summer, and he helped them to a seventh-place finish in the 2016-17 Eredivisie.
The Elland Road faithful were excited by Klich’s arrival and they took to Twitter to welcome him.
This is Futbol has rounded up some of the best tweets.
https://twitter.com/AnthonyyBurke/status/878178493988618240
Welcome to Leeds United! Marching on together!
— Fullerton Park LUSC (@luscfullerton) June 23, 2017
I got 99 problems but a Klich ain't one
— Luke (@SchofieldLuke) June 23, 2017
https://twitter.com/RMcgoran/status/878176403610619905
https://twitter.com/SupremeJansson/status/878176376552964096
Welcome to Leeds Klich #lufc #mot
— Adam Ross (@rossi_on) June 23, 2017
https://twitter.com/JamesLurcuck/status/878176229685252096
https://twitter.com/ellandread/status/878176131488243712
He has been capped on 10 occasions by Poland, but he has not featured since the 7-0 European Qualifying thrashing of Gibraltar in September 2014.