The 22-year-old has spent five months with the club and was given a standing ovation after being substituted on Saturday. But with a long-line of internationals currently higher up in the pecking order at Liverpool, he realises that it may be time to move on.
"I would be sad to leave Liverpool but it might be best for everyone," Whitbread told the South London Press. "I'd definitely consider the right move - and if Millwall came in, I could not rule it out.
"But I know Liverpool would ask for money - I have a year left on my contract.
"The ovation the Millwall fans gave me was unbelievable and something I'll remember all my life - a very emotional moment which left me speechless. I would really like to thank the fans for what was the highlight of my career so far.
"I am proud to have been at Millwall," he continued. "I just wish I could have helped us avoid relegation."