Around 50 intruders, believed to be the club's ultras, entered Sporting Lisbon's training facilities and assaulted the players and the staff following a disappointing season. Sporting has issued a statement condemning what it calls "acts of vandalism and the attacks on (our) athletes, coaches and professional staff".
The assailants covered their faces to avoid being identified and some players suffered injuries during the incident, with photos emerging of Dost suffering what appeared to be severe cuts to his head.
"The perpetrators of these incidents are not fans of football, they are criminals", the league said.
It has been claimed in the Portuguese media that dozens of people stormed the Alcochete site, trashing buildings and even assaulting some of the players and staff.
Sporting missed out on a Champions League berth for next season after a loss in the last round of the Portuguese league cost it a second-place finish last weekend. The changing room was heavily damaged. Attackers also targeted head coach Jorge Jesus and stabbed one of Sporting's physiotherapists, according to TVI24. This is not and can not be Sporting. "We will take every effort to establish full responsibility for what has happened and we will not fail to demand the punishment of those who acted in this absolutely pitiful way", a statement on the club's website reads.
Club president Bruno de Carvalho last month threatened to suspend almost the entire first-team squad after becoming involved in a public spat with the players over their performance in a Europa League match against Atletico Madrid.
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