British decathlete Ben Gregory, who represented Wales in three Commonwealth Games, is in a critical condition after suffering a fractured skull and neck in a serious bike accident last week.
Gregory, 31, suffered multiple brain haemorrhages, is in a coma and on life support, his partner Naomi Heffernan said on Instagram. Welsh Athletics confirmed the news on Twitter.
"Ben needs your positive thoughts and prayers right now," Heffernan said. "Those that know Ben know how strong he is mentally and physically, he's a fighter and he'll get through this."
Welsh Athletics said in a statement: "Our thoughts and prayers are with Ben's friends and family at this time.
"Ben's accomplishments as an athlete speak for themselves: Wales' greatest ever decathlete -- three Commonwealth Games, the Welsh record holder and representing Wales and Great Britain multiple times.
"The outpouring of support across social media is testament to his popularity as a person and as an athlete. Everyone who has had the privilege of training or competing alongside Ben will speak of his incredible love of life, his kindness, support and loyalty.
"We will all continue to pray for a full recovery for Ben."
Gregory competed in the 2010, 2014 and 2018 Commonwealth Games.