Sveum says the team wants to take a closer look at Arrieta, and Villanueva has experience in the bullpen. Jake Arrieta will join the Chicago Cubs' rotation on Friday, with Carlos Villanueva shifting to the bullpen. The Cubs acquired Arrieta in a July 2 trade with Baltimore. The Cubs' rotation for the upcoming series against the Cardinals will be Arrieta on Friday, Travis Wood on Saturday and Edwin Jackson on Sunday. "Not that Villanueva was doing horrible, but Rusin was doing really, really well, and it was hard to bump a guy who's given up one run or no runs every outing since he's been here," Sveum said. "'Villa' has done it before. Cubs manager Dale Sveum said they want the right-hander to join the team for the final six weeks of the season so pitching coach Chris Bosio can work with him.