Summer signing Aleksandar Mitrovic is Steve McClaren’s first choice to lead the Magpies line alongside Ayoze Perez, with Cisse having been banished to the bench since September.
The Senegal striker is again being linked with a move away from St James’ Park in January but the 30-year-old says he will work hard to win back his place.
“That’s the life of a footballer sometimes,” he told the Chronicle.
“It’s hard for me but I always say I will keep going, and keep my smile all the time. I know who I am and what I can bring to the team. I just wait.
“If I play, I will get chances to score and win games for Newcastle. I haven’t had that chance of late, so I need to keep going.
“When I go into work, I work hard. I know I must keep being busy and working. It feels like you’ve worked for nothing after a week of training when you don’t play. In my head I feel like I’ve done nothing, but I must keep going.”