The 24-year-old has returned to parent club Everton and will have surgery to repair the damage.

Pennington joined Ipswich last August on a season-long loan and made 31 appearances for the Championship club, scoring once.

"That's what happens when you are bottom of the table because he's been great for us," said boss Paul Lambert.

Ipswich are 13 points from safety with just seven games remaining.