Wood, who made a spot start May 6 for Matt Garza, when he was ill, will step into the rotation on Tuesday against the Astros, filling Chris Volstad's spot.
"I've been throwing the ball pretty well down there and hopefully it translates up here and I just go out and give the team a chance to win every fifth day," Wood said.
He has not been officially added to the Cubs' 25-man roster. The team will make a move on Tuesday.
"Hopefully, I'm able to stick around for a while this time," Wood said.
All he needed was an overnight bag when he joined the team to start May 6. He gave up three runs on three hits over six innings and the Cubs notched a win over the Dodgers. At Triple-A Iowa, Wood was 3-3 with a 4.57 ERA, but 2-0 in his last two outings.
"I think I just relaxed, quit pressing," said the lefty, who was optioned back to Iowa after the outing. "The pitches are there. I have to just quit trying to make them too good and just let them work."
Cubs manager Dale Sveum said Wood may have been trying to impress his new team too much. Wood admitted that may have been a problem. Now, he just wants to relax and pitch.
"Whatever's going to happen is going to happen," he said. "You just have to keep that mindset and stay relaxed. Once the ball leaves my hand, I have no control over it, so just try to make the pitch the best I can and see what happens and let the guys behind me do their job and see what happens."