Mulipola has made a big impression at Welford Road since initially arriving on a short-term deal in January.
The 25-year-old, who was part of the Samoa squad at the World Cup, has gone on to make 12 appearances for the Tigers and collect a LV= Cup winners' medal.
Director of rugby Richard Cockerill told the club's official site: "Logo came here as an international with Samoa but with no experience of European rugby or professional club rugby. He has settled into the Leicester Tigers set-up very well and he is working hard with us.
"He's already become a bit of a favourite with the supporters and we know there is even more to come from him as he continues to adapt to Premiership rugby with us."
Morris, 23, has also committed to the Tigers after scoring five tries in 14 appearances since joining from Leinster.
"Niall settled in well here in his first season and he's been a useful addition to the squad, playing full-back or wing," added Cockerill.
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