It has emerged that Bacuna cost around £800,000 from Groningen after previous indications suggested he arrived for more.
"Yes, Leo was a bargain but Westwood was probably cheaper," said Lambert. "Matt Lowton was around the same mark. Luna was the same - around that mark.
"When you look at it, I see figures that are bandied about with some of my players
"I think somebody must be getting a backhander because they're nowhere near that level of money!
"So I don't know where the figures come from. It makes me laugh because it's nowhere near that."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!