Is one-way connection to Internet safe?

My company network security people plan to start sending a subset of servers security log information to an external party on the Internet.
They claim that our servers on the internal network will be safe since this is only one-way communication out to a single address on Internet using https.

However, I am not 100% sure?
Can we still be infected even though this is a one-way communication out to Internet?
I’ve heard that some malware / worms can come through despite this being a one-way communication.

Thanks, Mike