 On 20 February 2013, Lamb would leave Northampton Saints to join Leicester Tigers for the 2013/14 season.However, on 10 February 2014, Lamb left Leicester Tigers after seven months to join with Worcester Warriors with immediate effect, where he rejoined Director of Rugby Dean Ryan at the Sixways Stadium.He scored the winning conversion as Worcester were promoted back to the Aviva Premiership for the 2015–2016 season, beating Bristol 59–58 on aggregate.