"before being signed for" is correct and usable in written English.
You would typically use it to describe what must happen before something is official, such as a document or agreement. For example, "The bill of sale must be reviewed and approved by both parties before being signed for."
Pauline Fisher, 65, who has been diagnosed with incurable kidney cancer, had worked at a DWP-run disability centre in Blackpool for 10 years before being signed off sick for six months last June.
In August 2006, Cogan signed for Barnet playing one season playing 39 appearances and scoring three goals in League Two, before being signed by Ronnie Jepson for Gillingham in June 2007.
But he failed to live up to expectations with the Gunners, and was loaned out first to Watford and Leeds United before being signed by Steve Bruce for Blues.
The left-sided midfielder grew up in Worcestershire and started his career with Cheltenham Town, before being signed by Mark Yates for Kidderminster Harriers in 2008.
He scored 53 goals in eight years, mostly in the Championship after loan spells out at Stockport and Luton, before being signed by Steve Bruce for Birmingham City in August 2006.
He scored twice in 58 appearances for the Dons before being signed by Roberto Martinez on a three-year contract for an undisclosed fee.
After his success in the Netherlands, Mokone joined Cardiff City and scored on his debut against Liverpool on the opening day of the 1959-60 season but made just two more appearances for them before being signed by Barcelona.
The keeper began his career with Peterborough United, before being signed by Manchester United in 2002 for £500,000.
Slew started his career with home town club Sheffield United before being signed by then Rovers manager Steve Kean for £1m in August 2011.
