Hull captain Gareth Ellis will undergo a scan on the foot that he injured during the warm-up of Friday's Super League defeat at Leeds Rhinos.
The England international was withdrawn ahead of the match against his former club before Hull were beaten 36-6.
"We'll just get him scanned and X-rayed and take it from there," Hull coach Peter Gentle told Sky Sports News.
"We could have probably needled it and risked him, but this early in the season there is no point doing that."
Ellis spent three years at Leeds before his departure to Australian outfit Wests Tigers in 2008.