Both player were linked with moves away from Stamford Bridge this summer, and for a while, were seemingly set to leave.
But, having opted to stay in the team under new manager Antonio Conte, both players have experienced contrasting starts to the Italian's reign.
Having been a fringe player last season, Oscar has started in all of Chelsea's Premier League games this season, while Fabregas has only seen 32 minutes of action.
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Fabregas scored two goals against Leicester City in the EFL Cup on Tuesday night, but is this enough to convince Conte of his qualities and earn him a spot in the team?
With the competition for a place in Conte's team as competitive as ever, is Fabregas' omission and Oscar's inclusion the right move?
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Let's compare the two midfielders by using stats from whoscored.com.
Last season saw Fabregas make 37 appearances, contributing with five goals and seven assists, while Oscar only managed three goals and three assists, though notably, made less appearances, featuring in only 27 games in the league.
Though playing in a much deeper role than Oscar, interestingly enough, Fabregas managed to be more influential in attack. He created 60 chances for the team and averaged 19 shots on target. Oscar, on the other hand, contributed less than half of his teammates tally, with only 26 chances and 16 shots on target.
The stats will come as a surprise to many, especially considering Fabregas was used as a central-midfielder last season, whilst Oscar was deemed more of an attacking-midfielder.
This season's stats do not do Oscar any favours either, as both players have managed one assist so far. But while the Brazilian made that one assist in 420 minutes of game time, Fabregas has managed that same tally in his lowly 32 minutes.
While both players sport comparable passing accuracy last season, (84% for Fabregas and 81.1% for Oscar), unsurprisingly, Fabregas dominates Oscar once again.
Last season saw Fabregas’ influence in midfield to full effect, having successfully played 2,375 successful passes in the league, and totaling 1.8 key passes per game.
Oscar, on the other hand, managed less than a third of Fabregas’ tally, managing 843 successful passes in midfield, and playing his teammates through onto chances only 1.1 times per game.
Distribution wise, Fabregas showed a more versatile passing range with 6.9 long balls per game compared to Oscar’s 2.3, showing the Spaniard's willingness to make those long balls up field.
This season, however, has seen Oscar be more influential in midfield, which indicates his game is changing under Conte.
He has managed to raise his passing accuracy to 84%, and managed a much better rate of key passes with 2.4.
Who deserves the midfield spot?
Oscar has seemingly found new life under Conte and has been granted a starting berth in the team, but while this seemingly is the case for now, it is a fact that Fabregas has a much more influential role in midfield that Oscar.
Despite often playing deeper in midfield than Oscar, Fabregas has still managed better stats for his team in terms of goal contribution and passing statistics.
After his showing against Leicester in the cup, maybe it's about time Conte sat up and took notice of what the Spaniard can bring to the team.
Who should Antonio Conte start in midfielder? Have YOUR say in the comment section below!