World number 13 Nick Kyrgios could have his eight-week tournament ban cut to three after agreeing to a "care plan".
The Australian was banned and fined for behaviour, including "lack of best efforts", at the Shanghai Masters.
The ATP confirmed the 21-year-old had "taken up the care plan on offer" but details are "strictly confidential".
If he completes the plan, Kyrgios can play from 7 November rather than the initial ban expiration date of 15 January 2017.
Kyrgios came under scrutiny after his 6-3 6-1 defeat by Mischa Zverev of Germany, in which he returned serves tamely and received a code violation for verbally abusing a spectator.