Based on the 1998–99 season player data for AS Roma, several key players had a significant impact on the team's performance:
 
Marco Delvecchio (FW) - No. 24
Delvecchio was a standout player for Roma this season, appearing in 31 matches and scoring 18 goals, making him the team's top scorer. His ability to find the back of the net consistently contributed greatly to Roma’s attacking threat. As a forward, his presence in the box and finishing ability were crucial for the team’s offense.
 
Francesco Totti (FW) - No. 10
Totti, Roma's iconic captain, also had an excellent season, with 31 appearances and 12 goals. His contributions went beyond just scoring, as he was also a creative force in Roma's midfield and attack. Totti’s leadership and vision on the field made him a central figure in the team’s success, as he combined playmaking with his own goal-scoring prowess.
 
Eusebio Di Francesco (MF) - No. 11
Di Francesco was another important contributor, playing 33 matches and scoring 8 goals from midfield. His goal tally was impressive for a midfielder, highlighting his ability to support the forwards and make key attacking runs. His work rate and versatility were also essential for Roma's balance between defense and attack.
 
Paulo Sérgio (FW) - No. 7
The Brazilian forward was highly effective, with 12 goals in 30 appearances. Paulo Sérgio added flair and finishing to Roma's forward line, complementing Delvecchio and Totti. His pace and technical skill were vital in breaking down opposition defenses.
 
Damiano Tommasi (MF) - No. 17
Tommasi played in 33 matches, scoring 1 goal. His contributions were more focused on the defensive side of midfield, where he provided stability and helped Roma control the tempo of the game. His work in shielding the defense and supporting transitions was invaluable for Roma’s overall game plan.
 
Cafu (DF) - No. 2
Cafu, the Brazilian right-back, played in 20 matches and scored 1 goal. His attacking prowess from defense added an extra dimension to Roma's play, as he was known for his overlapping runs and crossing ability. Cafu's energy and defensive solidity also contributed to Roma's ability to press high and recover the ball quickly.
 
Vincent Candela (DF) - No. 5
Candela, the French defender, appeared in 30 matches and scored 1 goal. As a full-back, Candela was a key figure in both defense and attack. His ability to support forward play while maintaining defensive duties made him one of the team's most reliable players.
 
Overall, players like Delvecchio, Totti, Di Francesco, and Paulo Sérgio provided the attacking firepower, while the likes of Tommasi, Cafu, and Candela offered defensive stability and balance, making this AS Roma side a well-rounded team during the 1998–99 season.