[1] In March 2015, Morelli signed a contract with EFL Championship side Middlesbrough until the end of the season, the result of Boro's partnership with Ituano.

[5] On 20 February 2017, Morelli signed a one-year contract extension with Middlesbrough before going on a year-long loan to Estonian Meistriliiga side FCI Levadia Tallinn.

[4][7] Morelli also played 90 minutes in both legs of Levadia's Europa League first qualifying round series against Irish club Cork City.

[8] Shortly after he signed for the club, manager Uwe Rösler was sacked and replaced by Joey Barton, under whom Morelli later recounted feeling "lost" after a drastic change of tactics and position.

[4] Later in the season, he played every minute of both legs in Levadia's extra-time loss to Icelandic club Stjarnan in Europa League qualifying.

[24] In June 2024, he was sanctioned for doping, receiving an 18 month ban, from a sample collected in August 2023 that tested positive for clomiphene metabolites.