Liverpool have thanked UEFA, Roma and the Italian authorities following "positive and productive" talks ahead of next Wednesday's Champions League semi-final at the Stadio Olimpico. The English club requested a meeting after the first leg on Tuesday was marred by incidents between rival fans prior to kick-off at Anfield. Two men from the Italian capital were charged on Thursday in connection with an attack on a 53-year-old man, who suffered serious head injuries and remains in a critical condition. With fears there could be further trouble during the return fixture on Italian soil, Liverpool now plan to release travel information for their fans to help guarantee their safety. "Liverpool Football Club would like to thank UEFA, Roma and the Italian authorities for providing the most up-to-date detail on operational procedures ahead of the Champions League tie on Wednesday," a statement from the club read. "A positive and productive meeting has taken place in Rome today [Friday], with all those involved displaying intent for a collaborative approach and a commitment to making the event a great sporting occasion. "Important guidance for travelling Liverpool supporters was discussed at length and the process is already under way to refine that information so it can be shared with those attending at the earliest opportunity. "The club, UEFA, Roma and the Italian authorities will continue to work together to deliver further information and we thank supporters for their patience while we collate, review and disseminate this guidance." Liverpool will have sold their allocation of 5,000 tickets for the second leg, while Merseyside Police have urged those without one not to travel.