Afterwards, Redknapp said that Tim Sherwood is "the type of player you want on your team and he was having another good game today.
"His injury looks bad - he isn't in good shape. He can't walk and it could be a broken leg".
It means that Portsmouth will struggle to field a strong midfield in Sunday's clash at Chelsea.
In other midfield news, Courtney Pitt, who had a successful loan spell with Luton earlier in the season, has joined Coventry City on a month's loan.