 Süper Lig club Beşiktaş were rumored to be interested in signing Khalfan in the off season to replace Hugo Almeida.On 22 September 2014, he scored his 63rd goal for Al Sadd against Al Shahania in a 3–2 win, surpassing Carlos Tenorio's 5-year-old record of 62 goals to become Al Sadd's all-time scorer.Khalfan first played for Qatar's youth teams, scoring 6 goals in the under-17 Gulf Cup held in 2003, helping Qatar finish runners-up in the process.