Middlesbrough announced the signing of striker Ashley Fletcher from West Ham for $A9.5 million.
The 21 year-old signed a four-year contract after finalising terms with the Championship club.
Fletcher follows Darren Randolph in leaving West Ham for Boro, the goalkeeper having completed a switch last week.
He is Boro's 11th signing in what has been a hectic transfer window for Garry Monk's side.
The England youth international progressed through the Manchester United academy but signed a four-year deal with West Ham in July last year, having impressed during a six-month loan spell with Barnsley.
He scored his only goal for the Hammers in a 4-1 EFL Cup defeat to his former club at Old Trafford in November.