Jordan Henderson
Henderson hasn\'t played since the 1-0 win over Bournemouth Getty

Jordan Henderson's injury problem has not improved despite travelling to the US for specialist treatment, according to manager Brendan Rodgers. Henderson, 25, has missed Liverpool's last four games with a heel problem he suffered in the 1-0 win over Bournemouth. His side have gone without a win in his absence.

According to the Guardian, the England international flew out to see New Jersey-based Dr John Cozzarelli to undergo a series of injections to resolve the problem. Liverpool had hoped the course of treatment would speed up the recovery with their midfield struggling in the absence of their captain, but Rodgers says the club are still unsure of a return date.

Speaking after the 1-1 draw with Bordeaux in their opening Europa League fixture, Rodgers told BT Sport: "I will see him tomorrow. He went out with Andy Massey our club doctor for some work in America," the Liverpool Echo reports. "He was getting a little bit frustrated because there was no improvement so it will take a couple of days to see how he is.

Henderson featured in Liverpool's opening two games of the season where the club recorded 1-0 wins away to Stoke City and at home to Bournemouth. While the Reds impressed in their 0-0 draw away to Arsenal, they have struggled in their other games in the absence of their captain where they suffered heavy losses to West Ham United and Manchester United.

Those losses have left the club 10th in the Premier League, eight points off leaders Manchester City. Adam Lallana's first goal of the season gave Liverpool the lead in France against Bordeaux on Thursday (17 September) evening but Rodgers' young side were unable to see out the contest, conceding an equaliser with 10 minutes to go. Liverpool welcome Norwich City to Anfield in their next Premier League game on Sunday 20 September.