Swindon manager Paolo di Canio has warned striker Mehdi Kerrouche he must improve his attitude to hold on to a first-team place.
The Algerian, 26, is the Robins' top scorer this season with eight goals.
But he was substituted after just 26 minutes in Saturday's FA Cup win at Colchester and dropped for their Johnstone's Paint Trophy win at Southend on Tuesday.
Di Canio told BBC Wiltshire: "He's professional but he can be lazy."
The Italian continued: "He will give his best in the future for sure but he has to train better. What you do in the game is a product of what you create during the week."
Kerrouche arrived at the County Ground in the summer on a two-year deal following his release from United Arab Emirates side Al-Oruba.
He has made 17 appearances so far this season but has not started a league game since 29 October in the 0-0 draw with Bradford.
And Di Canio believes Kerrouche has already improved since losing his regular place.
"In the last few days he has done well. I decided to leave him out but now he is better," he added.
"It's important he focuses his attention on the game and doesn't forget that the priority is the team not the individual player."