Middlesbrough boss Gordon Strachan has made a triple transfer move after completing deals for former Celtic trio Barry Robson, Willo Flood and Chris Killen. Robson has signed a two-and-a-half-year contract with the option of a further year after the two clubs agreed an undisclosed fee, while both Flood and Killen have joined their former manager on free transfers.

Flood's deal extends to June 2011 while Killen's runs until the end of the current season.