The 20-year-old, who joined from Internacional in the summer, made his debut for the club in Sunday's 2-0 win over Wigan Athletic.
"We're slowly looking to integrate Oscar like we did with others. He hasn't been with us long so we have to give time," Di Matteo told reporters.
Di Matteo has also revealed that Ramires could face Reading in the Premier League on Wednesday.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Arsenal | 34 | 24 | 5 | 5 | 82 | 26 | 56 | 77 |
| 2 | Liverpool | 33 | 22 | 8 | 3 | 75 | 32 | 43 | 74 |
| 3 | Manchester CityMan City | 32 | 22 | 7 | 3 | 76 | 32 | 44 | 73 |
| 4 | Aston Villa | 34 | 20 | 6 | 8 | 71 | 50 | 21 | 66 |
| 5 | Tottenham HotspurSpurs | 32 | 18 | 6 | 8 | 65 | 49 | 16 | 60 |
| 6 | Newcastle UnitedNewcastle | 32 | 15 | 5 | 12 | 69 | 52 | 17 | 50 |
| 7 | Manchester UnitedMan Utd | 32 | 15 | 5 | 12 | 47 | 48 | -1 | 50 |
| 8 | West Ham UnitedWest Ham | 34 | 13 | 9 | 12 | 54 | 63 | -9 | 48 |
| 9 | Chelsea | 32 | 13 | 8 | 11 | 61 | 57 | 4 | 47 |
| 10 | Brighton & Hove AlbionBrighton | 32 | 11 | 11 | 10 | 52 | 50 | 2 | 44 |
| 11 | Wolverhampton WanderersWolves | 33 | 12 | 7 | 14 | 46 | 53 | -7 | 43 |
| 12 | Fulham | 34 | 12 | 6 | 16 | 50 | 54 | -4 | 42 |
| 13 | Bournemouth | 33 | 11 | 9 | 13 | 48 | 60 | -12 | 42 |
| 14 | Crystal Palace | 33 | 9 | 9 | 15 | 42 | 56 | -14 | 36 |
| 15 | Brentford | 34 | 9 | 8 | 17 | 52 | 59 | -7 | 35 |
| 16 | Everton | 33 | 10 | 8 | 15 | 34 | 48 | -14 | 30 |
| 17 | Nottingham ForestNott'm Forest | 34 | 7 | 9 | 18 | 42 | 60 | -18 | 26 |
| 18 | Luton TownLuton | 34 | 6 | 7 | 21 | 47 | 75 | -28 | 25 |
| 19 | Burnley | 34 | 5 | 8 | 21 | 37 | 69 | -32 | 23 |
| 20 | Sheffield UnitedSheff Utd | 33 | 3 | 7 | 23 | 31 | 88 | -57 | 16 |
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