Liverpool midfielder James Milner had 15 stitches after sustaining a "crazy cut" to his head during his side's 5-0 friendly win over Napoli in Dublin.
Milner, 32, left the field in the second half after a collision with Portuguese defender Mario Rui.
"He's quite positive because he's not been given a mirror yet," said Reds boss Jurgen Klopp.
Liverpool's first Premier League game of 2018-19 is against West Ham at Anfield on 12 August (13:30 BST).
Alisson makes debut as Liverpool put five past Napoli
It is not yet clear whether Milner, who scored the first goal against Napoli, will miss that game.
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