Connect two separate hosts via vlan'd NICs to appear as one network

Hi,

We have two hosts in a datacentre and want to link them so they can be seen as one network.

The DC staff have connected vmNIC1 between each host via a VLAN across the datacentre. vmNIC0 on each is a connection to the internet.

Could someone help with how we now connect the two hosts so they are part of the same internal network?

Thanks in advance.