Striker Mark Viduka is set to complete his £4m move from Leeds to Middlesbrough on Monday after passing his medical.
The 28-year-old Australia international travelled to Teesside to undergo tests on Thursday ahead of the deal.
"Mark has passed his medical and we're hoping to complete a deal by Monday," said Boro spokesman Dave Allan.
Viduka earns a reported £65,000 a week at Leeds and is likely to want Middlesbrough to match those wages.
When Viduka, who joined Leeds from Celtic in a £6m deal four years ago, completes his move he will become the latest in a long list of big names who have left the Yorkshire over the past year.
Alan Smith joined Manchester United for £7m in May, while goalkeeper Paul Robinson moved to Tottenham for £1.5m and Newcastle have just completed the £5m signing of youngster James Milner.
Leeds have recruited Luton's Matthew Spring and Jermaine Wright from Ipswich in recent days.
They have also signed Julian Joachim, from Coventry, Paul Butler, from Wolves, and Michael Ricketts, from Middlesbrough, in the close season.