Malaysia's football season is opening amid serious concerns over player safety following a series of attacks.
Three members of the national team have suffered assaults this month, prompting the cancellation of the season-opening charity match on Friday.
One of the victims, winger Faisal Halim, was left in a critical condition after an acid attack in a shopping mall last weekend.
Police have yet to establish a motive, or whether the incidents are linked.
Malaysia's football association has urged high-profile players to take precautions, including hiring bodyguards.
Faisal Halim suffered serious burns after being splashed with acid while shopping near the capital, Kuala Lumpur, on 5 May.
The 25-year-old star winger has since undergone skin graft surgery. Football officials say he is responding but remains in intensive care.
Police are analysing the fingerprints of a suspect arrested at the mall, local media report.
In another incident midfielder Safiq Harim, 36, was left unharmed after he was confronted by hammer-wielding men who smashed in his car windscreen.
A third player, Akhyar Rashid, 26, was attacked by robbers outside his home.
The season-opening Charity Shield game was cancelled on Friday, after Faisal's club, Selangor FC, withdrew.