Lampard has yet to be offered an extension to his contract at Stamford Bridge - which expires at the end of the season - prompting speculation linking the 34-year-old with a move to the United States.
"Listen, we need players like that, and bringing in a Frank Lampard would obviously be good for the team," Keane told reporters.
"So hopefully, we will see him soon."
Former Tottenham striker Keane also commented on the future of Galaxy star Landon Donovan, who has previously indicated he was considering retirement in 2013.
The United States international, who has had two loan spells in the English Premier League with Everton, is expected to return to Bruce Arena's Galaxy squad ahead of the upcoming MLS season.
And Keane has insisted, although he has not spoken to his team-mate, any decision Donovan makes on his future should be respected.
"You have to respect someone's decision about what they want to do with their life," Keane said.
"For me, I enjoy being paid to do what I love. I can only speak on my experience, you have to respect someone's decision. If you need time off, you need time off."
Keane penned an extension to his LA Galaxy contract recently after reports emerged of a possible return to the Premier League with Queens Park Rangers in January.
The ex-Liverpool man said that it was an easy decision and expressed his happiness at being part of a growing league.
"I was happy here and there was no reason for me not to sign," Keane said.
"There's a lot of players in England that I speak to now even, younger players that want to come over here and play ... I was training with Tottenham for a couple weeks and a lot of the lads were asking how the league is going."
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