Lohan will appear in one of Glee's final episodes of the season as a celebrity judge at the Nationals competition.
Monteith - who plays Glee's Finn Hudson - suggested that working with the actress will be one the highlights of this season.
"We're super excited," he told Access Hollywood. "She's been through it all and I'm excited she's coming to the show."
Monteith's Glee co-star Harry Shum Jr also weighed in on Lohan's casting by touting her comedic experience on Saturday Night Live and in Mean Girls.
"I think she's funny," Shum said of Lohan's ability to adapt to Glee's comedic style.
It was reported earlier in the week that Lohan is focusing on her work rather than romance so as not to derail her career comeback.
Glee airs Tuesdays on Fox.
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