Manchester City have agreed a £34 million to sign Fernandinho from Shakhtar Donetsk, according to reports.
The Brazilian midfielder underwent a medical at Bridgewater Hospital in Manchester earlier today and will become the club's second signing after Jesús Navas.
Fernandinho's arrival will take City's spending to £58m already this summer.
Last year the Citizens were snubbed by Robin van Persie and made a slew of unsuccessful transfer deadline signings.
Keen not to repeat their mistakes, City are quickly strengthening their squad as they bid to regain the Barclays Premier League title from Manchester United.
The Citizens are yet to officially confirm Manuel Pellegrini as Roberto Mancini's replacement after the Italian was sacked last month.
Fernandinho, 28, joined Shakhtar in 2005 and was an integral part of their emergence on the Champions League scene.
It was believed City had reached a compromise over his fee, however they have instead triggered his buy-out. Fernandinho is the second most expensive player City have bought after the £38m they paid to Atlético Madrid for Sergio Agüero in 2011.