"Everyone was dejected in the changing room on Saturday but we need to pull together," Greening told WBA's website. "We have a great team spirit so we will stick together, roll our sleeves up and give it a right go at Newcastle.
"They're struggling at the moment so if we put on a good performance we've got every chance of getting a positive result. This is when team spirit comes into its own.
"Everybody wants to fight for each other and we have to show that - starting from tomorrow. We've got two games this week and we've got to try to get as many points as possible."