Brazil midfielder Felipe Anderson was undergoing a medical today before joining West Ham from Lazio in a deal worth up to £47million.

The 25-year-old — one of the quickest players in world football — has already agreed personal terms and is expected to sign in the next 72 hours if the medical is clear.

It is understood that the deal is worth an initial £41m, beating the previous club record of £25m for Marko Arnautovic last summer from Stoke — but could rise to £47m with performance-related payments.

Anderson, who has one senior cap, joined Lazio from Santos in 2013 and has scored 74 goals in 177 appearances for the Serie A club.

Anderson looks likely to operate on the opposite flank to West Ham’s other signing this week, Ukraine winger Andriy Yarmolenko, who joined from Borussia Dortmund for £17.5m.

New Hammers manager Manuel Pellegrini identified Anderson as a priority signing when he joined the club earlier this summer, but negotiations have been protracted, with the deal looking likely to be off at one stage because of Lazio’s financial demands.

The Anderson deal, when confirmed, will take West Ham’s spending to more than £90m, with more to come. Paraguay defender Fabian Balbuena was also expected to undergo a medical today prior to a £3m move from Corinthians.

The impending arrival of Anderson could mean that Michail Antonio leaves the London Stadium.

Antonio, who has been plagued by hamstring injuries, is valued at £15m and Crystal Palace and Burnley have both shown interest.

West Ham will be without striker Andy Carroll and central defender Winston Reid for a minimum of three months after the club revealed that both players need surgery. The pair had to leave the club’s pre-season training camp in Switzerland early and Richard Collinge, the club’s medical chief, said: “Andy is still reporting some discomfort in his ankle and further scans have revealed that he requires minor surgery to provide more strength and stability to the area.

“Winston has been suffering some swelling around the knee and he, too, is in need of explorative surgery. We have decided that this is the best course of action to ensure that both players have a chance of returning as soon as possible.”

West Ham are scheduled to play Wycombe Wanderers at Adams Park tomorrow.