Ngog came off the bench to bag a brace as Dougie Freedman's men overcame Charlton 2-0 at the Reebok Stadium last weekend.
On-loan Aston Villa full-back Stephen Warnock completes his spell this weekend, although Wanderers are keen on seeking an extension.
The situation among Freedman's long-term absentees remains unchanged.
Midfielder Mark Davies is sidelined for around three months after undergoing shoulder surgery, defender Matt Mills will not feature again until the new year with a thigh injury while Stuart Holden, David Wheater and Josh Vela remain unavailable due to long-term knee problems.
Bolton captain Kevin Davies is determined to see his team-mates follow up last week's success with another positive result.
"We've had a positive result a few times and not followed it up," he told Wanderers' official website. "Frustration is a word I've probably mentioned 50 times this year.
"It's important that we now carry on working hard. If you slack off you won't win games, it's not possible in this league."