Flamengo risk dropping out of the Copa Sudamericana qualification places in the Serie A table when they take on Chapecoense at the Maracanã Stadium on Sunday.They have failed to pick up a point in their last two outings, while the struggling visitors are yet to taste victory in the league this season.After going on a four-game winning run across all competitions at the start of the campaign, Flamengo appear to have run out of steam.Rogério Ceni's men have lost four of their subsequent six outings, including a 2-1 defeat at the hands of Atletico Mineiro last time out.This followed a narrow 1-0 defeat at the hands of Fluminense back in round nine of the Serie A fixtures.The dip in form has seen Flamengo drop to 12th place in the league table, level on points with Juventude just outside the final Copa Sudamericana qualification spot. View this post on Instagram A post shared by Flamengo (@flamengo)Meanwhile, Chapecoense's run of poor performances continued last time out as they fell to a 1-0 defeat against Corinthians.It was a third straight defeat for Chapecoense, who have failed to taste victory in the league this season.With 18 goals conceded, they hold the current worst defensive record in the league and this is a major highlight of their struggles.Jair Ventura's side are second-bottom in the Serie A table, two points ahead of last-placed Gremio.Flamengo vs Chapecoense Head-To-HeadFlamengo head into Sunday's showdown as the superior side, claiming 10 wins from 14 games against Chapecoense. The visitors have picked up two wins, while two games have ended all square.Flamengo Form Guide: W-L-W-L-LChapecoense Form Guide: L-D-L-L-LRead More: Fabrizio Romano's Transfer Roundup: Manchester United pushing for 2 more transfers, Barcelona's plans for Lionel Messi and moreFlamengo vs Chapecoense Team NewsFlamengoFlamengo will be without the services of Diego and Cesar, who have been ruled out through injuries. Everton Ribeiro and Gabriel Barbosa are on international duty with Brazil, who take on Argentina in the Copa America 2021 final. Vitinho is in line to return to the fold, having served his one-match ban on Wednesday.Injured: Diego, CesarSuspended: NoneUnavailable: Everton Ribeiro, Gabriel Barbosa View this post on Instagram A post shared by Flamengo (@flamengo)ChapecoenseThe visitors are without the likes of Moises Ribeiro, Tiepo, Leo Gomes and Joilson due to injuries. Midfielder Alan Santos is also a doubt after he was replaced with a slight injury at halftime against Corinthians.Injured: Moises Ribeiro, Tiepo, Leo Gomes, JoilsonSuspended: NoneDoubtful: Alan SantosFlamengo vs Chapecoense Predicted XIFlamengo Predicted XI (4-2-3-1): Diego Alves; Felipe Luis, Rodrigo Caio, Willian Arao, Matheuzinho; Gerson, Hugo Moura; Michael, Bruno Henrique, Arao; Rodrigo MunizChapecoense Predicted XI (3-4-2-1): Joao Paulo; Derlan, Felipe Santane, Ignacio; Mancha, Lima, Ravanelli, Matheus Ribeiro; Fernandinho, Mike; AnselmoFlamengo vs Chapecoense PredictionDespite both struggling for results in recent weeks, Flamengo have been the better side so far. Chapecoense are winless in the league this season, a run stretching back nine games. We predict Flamengo will return to winning ways as they have been dominant against Chapecoense in this fixture.Prediction: Flamengo 2-0 Chapecoense