Roberto Manuel Sierra Giménez (born 21 May 1996) known as Rober Sierra, is a Spanish professional footballer who plays as a midfielder for Steaua București.
In 2015 he was promoted to Atlético Levante, but in January 2016 he was sent on loan to Mallorca B until the end of the season.
[2] In the summer of 2016 he returned in Levente, but later decided to leave the team and join Ontinyent in Segunda División B.
[4] On 20 June 2022, he moved to Finland and joined Veikkausliiga club Inter Turku on a 1+1 year contract.
[5] In January 2023 Rober signed with the Bulgarian First League team Spartak Varna.