Padraig Harrington is in danger of missing this week's BMW PGA Championship at Wentworth because of a shoulder injury.
Three-time major winner Harrington withdrew from Wednesday's pro-am and is hoping that physio treatment will enable him to tee up on Thursday.
"It is definitely a possibility (missing the event)," world number 83 Harrington told BBC Sport.
"It is like frozen shoulder. I am struggling to lift my arm."