Long-Bailey has also voiced concerns about culture within the trust.
The Labour MP met consultants and trust executives in October after being contacted by some staff.
“They didn’t feel they could speak up,” she said. “A lot of staff members wanted to report issues anonymously. They didn’t feel safe even doing that.
“It seems that the issues have worsened since then. It’s an incredibly concerning situation particularly regarding patient safety and staff workloads.”
On Friday, Long-Bailey will meet all 14 unions representing staff at the trust.
She said she wanted to see meaningful change.
In a statement, NCA deputy chief executive Suzanne Robinson said: “Patient and colleague safety and wellbeing is our top priority.
“We recognise there have been challenges, and we have already taken action to strengthen governance, improve our processes and support our teams and we remain focused on the ongoing improvements that are still needed.
“Our colleagues play a vital role in this, and by listening and responding to their concerns, we can continue to make meaningful changes that benefit both our teams, services and the patients we care for.”