Add database into availability group

1. SQL 2012 Enterprise
2. Primary server and 2 x secondary servers
3. Windows 2012 R2

I have removed one of the database from availability group by mistake. Luckily I am still operational with primary server.  database on secondary servers are on restoring mode

- I have done full backup of database from primary (prod) server and restored on secondary servers with no recovery

when I add database into availability group I get an error message log missing

what is the best method to achieve and add database again into availability group

Note I cannot restore database on primary server as it is on production

Muhammad Mehdi