The 30-year-old was forced off with what at the time looked an innocuous injury but scans have since shown a rupture of the bicep femoris, ruling him out for up to five months.
Manager Stephen Robinson told the club’s website: “It is a big blow to us to lose Jon for the length of time, he has been excellent in pre-season and a great boy around the place, we will do everything possible to get him back as quick as possible.”
Obika was a free transfer arrival this summer after two years with St Mirren, having previously played for clubs including Oxford, Swindon, Charlton and Yeovil.
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