In March , however , the recurrent knee problems reappeared .
His season was over , followed by a successful surgery and rehabilitation in the United States ; he trialled with Premier League side Portsmouth after his release , but did not sign for them .
In March , however , the recurrent knee problems reappeared and his season was over , followed by a successful surgery and rehabilitation in the United States ; he trialled with Premier League side Portsmouth after his release , but did not sign for them .