The Norway forward was at his very best in a 6-2 win over Luton Town in the FA Cup fifth round.
Kovacic lavished praise on Halaand after his five goals secured them a quarter-final spot.
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Incredible. Incredible. Five goals in a game is unbelievable," said Kovacic after the game.
His mentality is to score goals and to be there fighting. Today I think his overall game was amazing. Not just the goals.
He's a player that you love and enjoy to have in your team."