Derby County's loan striker Jon Stead says he does not know if he will be staying at Pride Park beyond the January transfer window.
Rams boss Billy Davies is believed to be keen to make Stead's move from Sunderland permanent after seeing the 23-year-old strike up a decent partnership with Steve Howard.
Stead has scored three goals since joining Derby in October, helping them to win nine of 13 matches to move up to third in the Championship and into contention for automatic promotion.
He believes he has the ability to play in the Premiership despite disappointing spells there with both The Black Cats and Blackburn, but remains uncertain as to what the future holds.
"I've not spoken to [Sunderland manager] Roy Keane since I came here so I don't know his thoughts," Stead told The Times.
"I think I can perform to Premiership level but the way things are going here, this is a massive chance.
"It was tough last season. I was playing well, I just wasn't scoring. I think Ronaldo would have struggled to score in our team last season."
Stead believes his game has improved since he joined Derby thanks to Davies' attention to detail, including DVD compilations to analyse previous performances.
"If there's something not right, it's there in front of the whole squad, there's no hiding place," he said.
"The manager just doesn't want you to take your foot off. For every one thing you've done right, there'll be 10 things done wrong. That's the way he'll get the best out of us."