Heuer (elbow) might begin the season on the 60-day injured list, Andy Martinez of Marquee Sports Network reports.
Heuer is coming up on the one-year anniversary of his Tommy John surgery, so him getting a late start to the season was expected. The right-hander doesn't figure to be ready to join the Cubs' bullpen until at least June or so, and even after his return the team will likely be careful with his workload.