Alan Knill says everyone at the club is delighted to see striker David McGoldrick enjoying a prolific first season as a Blade.
The 31-year-old has netted nine times in 26 appearances in the Sky Bet Championship having arrived on a free transfer in the summer.
And ahead of a likely rest for Sunday's cup tie against Barnet, Chris Wilder's number two believes the Republic of Ireland international is playing some of the best football of his career.
Knill remarked: "We expected a lot from David and we still expect a lot from him. We expect more actually because we know he has more in him.
"He's a top player, he's played at a good level all his career. When we signed him there was a lot of talk about his injuries, but we did our due diligence on him, we asked a lot of people that we know and respect.
"Everything we were told, is what we're seeing now, it's our job to push him to make him better and he really wants to, we're so pleased for him."
United's assistant boss added: "He's humble, he wants to learn and he mixes well with the other players. We're just pleased he's scoring the goals we expected him to score.
"It wasn't rocket science signing him, he'd have been on everyone's radar, but his injuries were working against him.
"But he was at Ipswich and living in Nottingham, the travelling takes it toil. It was a no brainer for us, we saw his quality and he was a right good fit for us."