I'm a little worried with Lonergan on goal (if he starts), read some comments on him from fans of his previous clubs and they were less than impressed.
Anyway, I'd go with same line-up as last week. I'd even keep Origi. Mane looks fit enough to start, but Origi has done well and there is no reason to bench him right away. Firmino is a must start though, he's our best player at the moment.
If Adrian is injured then it has to be Lonergan. He should be able to do whats required with the defence we have in front of him and as long as we arent marauding up the pitch he shouldn't have much to do.