Megson has beaten a number of clubs for the 29-year-old's services after his contract at Fratton Park expired.

our bid

Midfielder Davis has agreed a three-year deal and Megson said: "We are delighted to have signed such an experienced Premier League footballer.

"Sean made 40 appearances last season for Portsmouth and he will strengthen our midfield.

"We wanted to bring him to the Reebok in January but our bid of £3.5m was turned down by Portsmouth, who didn't want him to leave."

London-born Davis has made nearly 200 top-flight appearances with Fulham, Tottenham and Portsmouth.

He is also a former England Under-21 international, earning 12 caps between 2000 and 2002.