Steelers' Johnson, Heyward expected to miss weeks due to injuries

Steelers wide receiver Diontae Johnson sustained a hamstring injury and is expected to miss a few weeks.
Steelers defensive tackle Cameron Heyward has a groin injury and could also miss several weeks.
Heyward has not decided on surgery yet and is seeking another opinion on his injury.
Johnson was injured during the Steelers' 30-7 loss to the 49ers.
Before his injury, Johnson had three catches for 48 yards against the 49ers.