Former world number seven Fernando Verdasco has accepted a two-month ban from the International Tennis Integrity Agency for violating anti-doping rules.
The Spaniard, 39, tested positive for methylphenidate at an ATP Challenger event in February.
World number 125 forgot to renew his Therapeutic Use Exemption (TUE) for the drug used to treat ADHD.
The ITIA said it “accepts that the player did not intend to cheat”.
A TUE is an official medical document authorizing an athlete to take a drug normally prohibited but intended for the treatment of a legitimate condition.
The ITIA added in a statement: “Its breach was unintentional and unintentional, and it bears no significant fault or negligence.”
Verdasco’s ban has been reduced from two years to two months to reflect his degree of misconduct, meaning he can return to play in January.
He was granted a new TUE for the drug.
