Grade II winner Captain Squire has been sidelined with bone chips in one knee and will probably be retired, co-owner Robert Bone confirmed Sept. 22."He'll have surgery and we'll give him plenty of time," Bone said. "It's a possibility (that he could come back) but not probable. If he shows us any sign that he shouldn't, then that will be it. He's done enough."A 5-year-old Florida-bred gelding by Flying Chevron–Dolly's Back, by At the Threshold, Captain Squire has earned $837,965 in 23 starts, including six firsts, six seconds and four thirds. He has not raced since a third-place finish in a one-mile allowance turf race at Hollywood Park June 6, and is resting at a farm in Florida, Bone said.Jeff Mullins has trained the bay throughout his career for Bone and co-owner Jeff Diener.Captain Squire captured the seven-furlong Lazaro Barrera Memorial (gr. II) at Hollywood Park in May 2002. In January 2003, he won the Sunshine Millions FedEX Sprint at Santa Anita. Later that year, he ran third in the Dubai Golden Shaheen (UAE-I) in Dubai and was second in the Ancient Title Breeders' Cup Handicap (gr. I) at Santa Anita. He ran in the Breeders' Cup Sprint after that, finishing seventh.Since returning from ankle problems earlier this year Captain Squire has not been the same, Bone noted, winning just once in six starts in 2004. "He hasn't wanted to finish," he said.