The 19-year-old midfielder, who made his City debut earlier this season, links up with Ian Holloway’s side as they battle to stave off relegation from the Championship.
Etuhu made his bow for the Blues in the Carling Cup tie with Norwich City, his slide-rule pass setting up Georgios Samaras to pounce for the winning goal. His first start came against Spurs and just a week later he had his first goal, the final one in the 4-2 home win over Bolton. His most recent game was the draw with Derby at the end of January.
Last season saw Kelvin make an impact while on loan at Rochdale, that stint being cut short by a serious knee ligament injury which he had completely shaken off by the start of pre-season.