Ivan Campo finally signed for Bolton on a three-year deal after a mystery problem discovered during the Spaniard's medical was overcome.
Campo has made a big impact since he signed on loan
The Real Madrid player spent last season on loan at the Reebok Stadium and manager Sam Allardyce had hoped to confirm his signing at a press conference on Thursday.
But the club put the permanent move on hold while further investigations were carried out into the problem.
However, the player finally signed his permanent deal on Friday, although the club have not disclosed the nature of the problem.
It was thought that the deal would be on hold until Monday at least but a Bolton spokesman said: "Ivan has passed his medical
and signed a three-year deal which we are very pleased about.
"There were initial problems with his medical yesterday which we cannot
divulge but they have been resolved."
Allardyce is hoping that Campo will play a key role at the club next season as Bolton contest their third consecutive Premiership campaign.
"I am absolutely thrilled that the deal has now been
finalised and totally delighted that we have secured the
services of Ivan for the next three years," said Allardyce.
Allardyce had given up hope of signing Campo last month when he experienced difficulties with the former Spain international's agent.
Campo, who had also been linked with a move to Sporting Lisbon, joined Bolton on loan from Madrid in August 2002 and started 30 Premiership matches last season.