The 22-year-old midfielder scored twice for the Italian outfit in their 14-0 victory over Auronzo on Sunday.
It was Lazio’s first pre-season game, as they continued their preparations for the upcoming 2015-16 campaign.
Morrison, a former Queens Park Rangers and Cardiff City loanee, was delighted with his contribution to the result and posted the following message on Twitter after the win:
very happy to play my first game for Ss Lazio today. Great Win happy with my 2 Goals— R (@morrisonravel) July 12, 2015
The youngster was actually linked to Championship outfit QPR this summer despite having signed a pre-contract with Lazio in the middle of the 2014-15 season.
According to a report in The Mirror earlier this month, talks regarding the move of the former England Under-21 international to Loftus Road were at an advanced stage.
However, Morrison seems set to remain at Lazio, who finished third in Serie A last season and stand a chance of playing in the group stage of the 2015-16 Champions League campaign.