The Czech striker has recently got back into contention.
He suffered a broken leg early on in his Villa career and has failed to establish himself as a first-team regular at the club despite showing some early promise.
That saw him out of contention and seemingly on his way out of the club in recent months.
But recently he has been getting more game time as Remi Garde decided to change things up in the New Year.
This week he has been speaking to the press in his Czech homeland and discussed his struggles at the club and his recent return to first-team action. He told Denik:
"Hard question. After quite successful preparation I expected that chance could come early in the season, but it did not come.
"Why it happened, I do not know. They buy new players and the coach (Tim Sherwood) preferred them.
"In football, things change faster than one would expect. And whether it's for better or worse.
"When coach Garde came to the team in early November, he had to make quick decisions.
"One of them was that I moved even more backward in the team hierarchy.
"But I was patient, I continued to work hard in training. I managed some games in reserves. I started to move higher until now in the starting lineup."
Kozak has managed to score just four goals for Villa in his time in England. But his last strike for the club came in a 2-1 defeat at Stoke City way back in December 2013 - although he did miss the entire 2014-15 season with injury.
He will be one player hoping to get something from the end of this disappointing season.
If he can start to score goals on a more regular basis then he might be considered a good option for next season at Villa Park or indeed elsewhere if the club decide to move him on.