Republic of Ireland international Michael Obafemi will miss the start of the Premier League season with a hamstring injury suffered while on international duty.The 22-year-old Burnley frontman tore his hamstring in the Republic of Ireland's 3-0 win over Gibraltar and will undergo an operation later this week before beginning a rehabilitation process.Obafemi joined the Clarets on loan from Swansea in January, and scored two goals in 14 appearances before making his move permanent earlier this month.The injury will be a blow to Vincent Kompany's attacking options as Burnley make their return to the Premier League.The Clarets reportedly remain in talks to re-sign Nathan Tella from Southampton after he topped Burnley's scoring charts with 19 goals last term