Napoli confirm David Ospina's CAT scan was clear and he did not lose consciousness, but had a "hypotensive crisis" following the head injury.
Napoli goalkeeper David Ospina.
Napoli players looked horrified as he was being stretched off, with keeper Alex Meret readying himself to come on.
The 30-year-old, who is on loan from Arsenal, will miss Colombia's global friendlies against Japan on March 22 and South Korea four days later after suddenly falling to the ground 41 minutes after receiving treatment following his collision with Ignacio Pussetto during Sunday's 4-2 win over Udinese.
Ospina looked unconscious as Napoli's medical team rushed to offer him a treatment - but it was later reported he regained consciousness in hospital after being diagnosed with a head trauma and remain there overnight.
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Napoli travel to play Ospina's parent club Arsenal in the first leg of the Europa League quarter-finals on April 11.
"Ospina will remain at Napoli next season, regardless of how many games he plays", the Napoli boss said in February, per FourFourTwo. A Dries Mertens goal secured the points for Carlo Ancelotti's side.
He arrived at Arsenal in the summer of 2014 but failed to nail a starting role at the Emirates, making just 27 league appearances for the Gunners.
Udinese had pulled back from two goals down to level the match when Ospina was forced off.