Hull's Australian scrum-half Brett Seymour was suffering from depression when he crashed his car at the weekend.
The 28-year-old spent Sunday night in hospital after his BMW hit two parked vehicles and flipped onto its roof, although he was discharged on Monday afternoon after being cleared of serious injury.
The incident came 24 hours after Seymour had been abused by fans for his part in Hull's surprise 36-16 defeat at Widnes.
Seymour has since been placed on leave by Hull and is believed to have left the city to go on a break with his wife Roseanne.
Roseanne Seymour told a Facebook group created to wish her husband a speedy recovery: "He is getting the help he needs and your support has helped greatly.
"Depression is a silent killer - I want each and every one of you to know that we feel so grateful to you."
Neither Hull nor the Rugby Football League has made any official comment but it is understood Seymour has received counselling from representatives of both organisations and the Super League players' association, 1eague3, has promised its help.
Seymour had a chequered career in the National Rugby League before arriving at Hull for the start of the 2012 season.
He was sacked by Brisbane Broncos in 2006 and Cronulla Sharks in 2009 for alcohol-related incidents and he was given a seven-month driving ban in November 2011 as he ended his stint at New Zealand Warriors.