A wireless device (120) and method for performing cell configuration. The wireless device and a first network node (111) serving the wireless device are operating in a wireless communications network (100), wherein the first network node manages a first serving cell (111a). When the wireless device is to send a second Random Access (RA) transmission in the first serving cell to the first network node while preparing to perform or performing configuration of a second serving cell managed by a second network node, the wireless device configures the second serving cell using a configuration time delay Tact_PSCell comprising at least a time delay TRA_PCell due to the second RA transmission, otherwise the wireless device configures the second serving cell using the configuration time delay Tact_PSCell excluding the time delay TRA_PCell due to the second RA transmission.