Striker Cisse returned from a three-match ban on Saturday to score his second goal in three games since his January move from Lazio.
But it was not enough to prevent a controversial 2-1 defeat at Bolton that sucked Rangers into the drop zone.
Cisse is not worried, though, and told his club’s official website: “With this kind of performance, there’s no doubt that we are going to stay up.
“We have to produce this every game and we have to score goals. We have to fight until the end and that’s what we are going to do.
“I love challenges and I love the club already. I will do my best to help the club stay up because we belong in the Premier League now.”
Javi Gracia said it was always going to be an uphill battle for Watford after conceding so early against Liverpool on Saturday.
Schalke 04 boss Dominico Tedesco paid tribute to goalkeeper Ralf Fahrmann after his 76th-minute penalty save proved crucial in a 1-0 win over Wolfsburg.
Mattia De Sciglio stunned that Juventus were shocked to be held to a goalless draw with SPAL on Saturday.
Sunderland have suspended midfielder Darron Gibson with immediate effect after he was charged with drink driving.
Jose Mourinho's recent bad frame of mind was still present despite Manchester United beating Brighton 2-0 at Old Trafford on Saturday, a result that puts them into the last four of the FA Cup.
Mohamed Salah continued his astounding goalscoring form on Saturday, hitting four goals as Liverpool thrashed Watford 5-0 at Anfield.