ROME, Feb. 10 (Xinhua) -- Italian soccer clubs are putting full-strength to build up their stadium security in order to comply with required standards for an early return of isolated fans.

    Those stadiums failed to meet criteria set by the Italy government will have their fans locked out of their venues under the crackdown imposed in the wake of last week's fatal riot in Sicily.

    Professional soccer was suspended after last Friday's violence, but resumes this weekend. Serie B matches will be played on Saturday and Serie A matches will be played on Sunday.

    The grounds of 11 clubs in the top two divisions, including Milan's San Siro stadium, home to AC and Inter Milan, have been deemed unsafe and will not be permitted spectators.

    However, AC Milan have employed 100 people who have been working around the clock to improve their security in the hope that they will be able to let fans in for Sunday's home match against Livorno.

    The club have installed 28 additional turnstiles to meet one of the safety criteria laid down by the government in the hope they can reach a compromise and be allowed to open their doors to season-ticket holders.

    The San Siro, which has a capacity of 78,000, requires 160 turnstiles.

    Messina had hoped to stage their match against Catania after constructing a police viewpoint that was required of them, but given the match is another Sicilian derby local authorities insisted on closed doors.