Forster, signed on loan from Premier League club Southampton in the summer transfer window, made a number of brilliant saves between the posts, while 26-year-old central defender Jullien - who moved to the Hoops from Toulouse in the summer transfer window for a fee reported by The Scottish Sun to be worth £7 million - was very good defensively.
Lennon has praised the 31-year-old England international goalkeeper and 26-year-old French central defender.
Lennon told BBC Sport: "My goalkeeper made some great saves, which he is paid to do and he's done before.
“My centre-half Jullien was incredible, and then we have the quality players going forward.”
Big win for Celtic
The win against Lazio means that Celtic have booked their place in the knockout rounds of the Europa League.
The Hoops have been superb in the Europa League so far this season, and the Glasgow giants are also going strong in the Scottish Premiership.
Have something to tell us about this article?