Charlton have signed Cameroon striker Rudolph Douala on a pay-as-you-play deal until the end of the season.

The 30-year-old former Sporting Lisbon player had been with Portsmouth until his release.

He had spent most of his career playing in Portugal.

Manager Phil Parkinson, who watched him play for Charlton Reserves at Southampton last week, said: "He's worth having another look at. He's come to us on a pay as you play agreement, so he will cost us only wages."