John Terry has missed Chelsea's last two league games with an Achilles injury

Chelsea captain John Terry is undergoing platelet-rich plasma therapy in an effort to recover from injury before the end of the season.

The 35 year-old has missed his side's last two Premier League games after aggravating an Achilles injury prior to the 4-0 win over Aston Villa on April 2.

The Blues skipper, who is out of contract at the end of the current campaign, has only recently recovered from a long-term hamstring problem.

Despite the plasma therapy, Terry is still expected to remain sidelined for at least another two weeks. The former England international took to Instagram to post an image of himself undergoing a session of therapy.

"Being injured is the most frustrating thing as a player. Working hard to get back fit," he wrote.

Platelet-rich plasma therapy, or PRP, has been used by a number of athletes, including Tiger Woods, to speed up rehabilitation from injury.

Terry's future at Stamford Bridge is unclear, with the defender out of contract at the end of the season

The practice was prohibited by the World Anti-doping Agency (WADA) until 2011.

"Despite the presence of some growth factors, platelet-derived preparations were removed from the (prohibited) list as current studies on PRP do not demonstrate any potential for performance enhancement beyond a potential therapeutic effect," read a statement on the WADA website.

Chelsea will be without Terry when Manchester City visit Stamford Bridge in the league on Saturday.