Derby manager Billy Davies has ended his search for "a proven goalscorer" after completing the deadline-day signing of Scotland striker Kenny Miller for an undisclosed fee.Miller, 27, has signed a three-year contract with the Rams just a year after joining Celtic on a free transfer from Wolves. He was edged out of Gordon Strachan's plans by the summer signings of Scott McDonald and Chris Killen, while the likes of Jan Vennegoor of Hesselink, Maciej Zurawski and Derek Riordan are also vying for places up front. Davies had been linked with both Portsmouth's David Nugent and Trinidad & Tobago striker Kenwyne Jones but turned his attentions to Miller after Nugent pledged to fight for his place at Fratton Park and Jones moved to Sunderland for £6million. Davies told the club's official website, www.dcfc.co.uk: 'We are delighted to have added to the squad a player with outstanding commitment and a never-say-die attitude who will be a real handful for back fours in the Premier League. 'He is a proven goalscorer both at club and international level and gives us a different option up front.' Miller rose to prominence with Hibernian before spending 18 months with Celtic's Old Firm rivals Rangers following a £3million switch. He last played in the Barclays Premier League with Wolves during the 2003/04 season. He scored just twice in the league during that campaign -- in successive games against Liverpool and Manchester United -- as well as three goals in cup competitions. Miller is unavailable for tomorrow's match with Liverpool having missed the 12 noon registration deadline.