Edgar Davids has completed his move from Tottenham back to Ajax, the club where he first made his name as a skilful and tenacious midfielder.

Davids, 33, has signed an 18-month contract which is likely to see him end his career at the club he played for between 1991 and 1996, helping them to win the 1992 UEFA Cup and the UEFA Champions League in 1995.

He subsequently wore the colours of AC Milan, Juventus, Barcelona and Internazionale before being lured to London by fellow Dutchman Martin Jol, the Spurs boss, in 2005.

Davids, who turned down the chance of a move to the United States to play for FC Dallas, was a key figure for Spurs last season when they narrowly missed out on a place in the UEFA Champions League.

But he had grown frustrated this season at being unable to command a regular starting place and Jol admitted the pair had clashed.

"He played last year but didn't this year," Jol said. "I had so many arguments with him, because in Holland he's a legend.

"He will ask me 'why am I not playing' so I tell him. He is a legend and was a very good pro for us - he played on the left when I needed him. It was a difficult situation, so for him it's better if he plays regular football because of his age."

In other moves on the penultimate day of the January transfer window, struggling Wigan completed the 2.4-million-pound (4.8 million dollars) signing of Nigerian striker Julius Aghahowa from Ukrainian club Shakhtar Donetsk.

Aghahowa, 24, was given the go-ahead to complete his move after being granted a work permit and Latics boss Paul Jewell expects the forward to help pull Wigan away from the relegation battle.

"We've really done our homework on this one, while I've watched him personally on two occasions," Jewell said.

"He's quick, strong, aggressive, good with both feet and I'm sure he will adapt to the rigours of the Premiership."

Blackburn have filled the defensive gap created by Australian Lucas Neill's switch to West Ham by signing the Swiss international left-back Bruno Berner from FC Basel.

Berner, 29, has signed an 18-month deal for an undisclosed "small transfer fee." Blackburn have a further one-year option on the defender, who is ineligible to play in this season's UEFA Cup.

Charlton have bolstered their squad for the battle to avoid relegation by taking teenager Alexandre Song on loan from Arsenal.

The 19-year-old Cameroon midfielder remains on the fringes of Arsenal's first-team squad and Gunners boss Arsene Wenger was keen for him to gain more first-team experience.

"In central midfield we are a bit congested, and he is ready to play," Wenger said last week.

Song is the nephew of former Cameroon international Rigobert Song. He joined the Gunners from French club SC Bastia in July 2005.

His arrival at Charlton follows the 2.5-million-pound (five million dollars) signing of Algerian defender Madjid Bougherra from Sheffield Wednesday. Both players are expected to be in Alan Pardew's squad for Wednesday's Premiership match at Bolton.

Reading paid an "undisclosed club record fee" to sign Greg Halford from Championship side Colchester. Halford, 22, can play in defence or midfield and has agreed a three-and-a-half year contract.

Royals boss Steve Coppell had earlier on Tuesday signed defender Alan Bennett from Irish club Cork City.

West Ham meanwhile denied reports they had bid 18 million pounds (35 million dollars) for Charlton striker Darren Bent, who is currently sidelined with a knee injury.

Newcastle confirmed that they had completed the signing of United States defender Oguchi Onyewu on loan from Belgian club Standard Liege until the end of the season.

Elsewhere, Liverpool were reportedly close to signing 18-year-old midfielder Francis Duran from Spanish second division side Malaga, while Manchester City were expected to confirm the signing of former England international Michael Ball from PSV Eindhoven.