The 31-year-old scrum-half is in his second spell with the Tigers having also spent seven years at Newcastle (2002-9).
However, with Ben Youngs, Micky Young and Sam Harrison all competing for the No 9 shirt and the emergence of Scottish youngster Scott Steele, the Tigers have plenty of options.
And that means the 31-year-old Grindal will be looking for a new club at the end of the season.
Cockerill told the Leicester Mercury: "James will not be with us next season. He knows that and is a bit disappointed with that.
"James has a young family and, hopefully, he can get sorted with a new club. You saw on Saturday's evidence that he can still play."
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The Barbarians are one of the top invitational rugby sides with a long history and classic rugby jersey.
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The Lions are ready to get their Australia tour underway. They arrive in Perth on Monday.
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The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.
