Tennis could be facing its second drug scandal in three days after reports emerge Marin Cilic has 'failed' a drug test

World No 15 pulled out of Wimbledon second round with a reported knee injury but Croation newspaper claims he is serving a three-month ban for a failed test

Tennis could be facing its second drug shame in a week after reports emerged in Croatia that world number 15 Marin Cilic has failed a drugs test.

World No 56 Viktor Troicki was banned for 18 months on Friday for failing to provide a blood sample when requested during the Monte Carlo Masters in April.

And now, early reports are suggesting that Cilic is currently serving a three-month ban after testing positive in Munich in April.

Cilic, who lost to Wimbledon champion Andy Murray in the final of the AEGON Championship at Queens, pulled out of his second-round match against Kenny De Schepper at SW19 with a reported knee injury, but it is now being claimed that his withdrawal was due to the positive test.

Vincent Stavaux, Cilic’s manager, told Croatian daily newspaper, the Jutarnji list: “There are no comments until we will be able to comment.”

The International Tennis Federation, who oversee the sport’s anti-doping programme, have also refused to comment in the wake of the allegations.

It is claimed that Cilic failed the test due to “incautious use of glucose”, after one of the Croatian’s confidents bought some in a pharmacy while he was competing during the BMW Open. The product is believed to have come with a written warning on the label to all sportspeople.