Chelsea No2 Newton delighted Terry made Cup win over Wolves
Blues No2 Eddie Newton admitted it was not certain he would be able to do until Terry was allowed home on the second day of his Football Association racism hearing.
The defender left Wembley at 1.15pm and asked when the final decision over his involvement on Tuesday night had been taken, Newton said: "This afternoon."
Newton denied Terry had specifically asked to be involved but added: "We wanted John to start. Obviously, with everything happening with the FA, we had to see how it panned out.
"We had a phone call (saying) he was making his way back from the FA nice and early, so it wasn't last minute.
"We'd covered all the bases, all the scenarios, and the best one happened."
Newton claimed Terry had not been adversely affected by facing an independent FA panel over the past two days as he attempts to clear his name once and for all.
"We've been talking to John and seeing what his mindset is," Newton said.
"He's been very positive and wanted to play, and do what he does for the team."
Newton added: "From knowing John, he's a positive person who loves the club. "He's very enthusiastic about playing, just as he was as a young man. He just wants to play.
"He's been fine, dealing with the situation at hand, coming in and doing what he has to do at the club.
"We've been talking to him, Robbie [Di Matteo] has been talking to him, and he's been positive and upbeat. It wasn't a problem."