Sam Burgess’s long-term future in rugby union may be in the back row

• ‘Barnstorming’ cameo for Bath reinforces coach’s view• England target will continue as a centre for now• Blast-off for Burgess in Bath cruiseSam Burgess’s long-term future could be in the back row even though he made a low-key debut in the 15-man code for Bath as an inside-centre. The rugby league convert played 17 minutes as a substitute for Bath in their 25-6 Premiership win over Harlequins on Friday night. It was his first action since playing for the Australian side South Sydney Rabbitohs in the NRL Grand Final on 5 October.Burgess was limited to two big carries against Harlequins, which…