Defender Calum Woods has admitted he's enjoying his time at Huddersfield after signing a new one-year contract extension at the club.
The new deal will keep the 25-year-old at the John Smith's Stadium until the summer of 2014, with the Yorkshire club having the option of an additional year.
Woods agreed a two-year contract when he joined the Terriers from Dunfermline in 2011 and has since made 40 appearances for Simon Grayson's men.
He said: "Huddersfield is the place I want to be, so it was an easy decision.
"The club has been moving in the right direction ever since I joined and I want to be a part of the future success it will enjoy."
Grayson added: "His character is exactly what we want in the squad. We're expecting even bigger and better things to come from Calum over the next few years."
The 28-year-old signed hours before making his debut in the Iron's 2-1 defeat to Bury on Tuesday and is looking forward to playing regular football.
"I'm delighted to be here," he said. "It's a good club, and I was delighted to hear of the interest. As a footballer, you want to be playing."
Scunthorpe manager Brian Laws praised McChrystal for slotting straight into the team.
He said: "Great credit to him because he went out there without knowing a soul. I thought he did very well considering he's just walked into this football club."
