Arsenal boss Arsene Wenger says he could risk Cesc Fabregas against Porto despite him having a hamstring injury.
Fabregas suffered a recurrence of the injury against Burnley at the weekend and he is rated doubtful for Tuesday night's Champions League clash.
The Gunners have to overturn a 2-1 deficit from the first leg and Wenger says he could take a risk on his star midfielder, who bagged his 14th goal of the season against the Clarets.
"I'm ready to take the gamble," said Wenger. "But if there is more than a 50 per cent chance of his hamstring going I will not take it.
"You look at the Fabregas numbers and they are amazing - 14 goals and 15 assists.
"He's a fantastic player with a fantastic attitude and commitment. And what people forget, an unbelievable work-rate too.
"This season he has taken a big step forward, massive. At 22 years of age he has matured."