The midfielder left St James' Park yesterday in a £10m deal, activating a lucrative sell-on clause included by Leeds in the agreement which took him to Tyneside in 2004.

The sell-on clause applies to the profit made by Newcastle on Milner, who joined the Tyneside club in 2004 for a fee rising to a maximum of £5m.

Newcastle bowed to Milner's insistence on exiting St James' Park after receiving a transfer request from the 22-year-old.

Milner, pictured right, began his professional career at Elland Road and became the youngest goalscorer in a Premier League fixture, aged 16 years and 357 days, when he struck against Sunderland on Boxing Day 2002.

But the Leeds board headed by Gerald Krasner sold him to Newcastle following United's relegation from the top-flight.

Newcastle recently attempted to buy out Milner's sell-on clause following his decision to submit a transfer request at St James' Park, but the offer was turned down by Leeds in anticipation of the midfielder's switch away from Tyneside.

Milner has agreed a four-year deal at Villa Park.