Arsenal's Freddie Ljungberg is unlikely to play in Sunday's match at Portsmouth because of an ongoing migraine problem.
The 27-year-old Swedish midfielder fell ill before last week's Champions League tie with Rosenborg and did not feature in Sunday's game with Chelsea.
"He recovered but even on Saturday he did not look completely right," boss Arsene Wenger told the club's website.
"I would not have started him but he came with us on Sunday. Then he had a sudden resurgence of his migraine."
Ljungberg last played in Arsenal's 3-0 home win over Birmingham on 4 December.
"We had to send him back home. The doctor said we have to keep him out of training for at least four or five days," Wenger added.