Oscar celebrates his second goal against Arsenal. Reuters

Chelsea playmaker Oscar has admitted the departure of Juan Mata from Stamford Bridge has helped him regain his scoring form.

The Spain international left the west London club and completed his £37.1m move to Manchester United during the mid-season transfer window. United star played behind the striker during the previous campaign at Chelsea.

However, the return of Jose Mourinho has seen Mata's first team appearances and the Portuguese tactician deployed Oscar to play behind the lone striker for the Blues this season. Since the Spaniard's move to Old Trafford, Oscar has found the back of the net five times in all competitions.

The Brazil international has seen a dip in his form in the middle of the season and has regained it in recent times. Oscar believes the departure of Mata has helped him improve his form in front of the goal.

"I have been trying to score more and it has helped that Mata has gone. I'm just trying to develop my game and I want to continue improving. For me it doesn't matter if I don't score as long as we win," Oscar told Sky Sports.

Meanwhile, Chelsea star Eden Hazard will be out of action for the next two weeks after the Belgium international picked up a calf injury during the Blues' 2-0 Champions League victory over Paris Saint-Germain.

Hazard is likely to miss the first leg of the Champions League semi-final clash against Atletico Madrid as the Blues face the Spanish capital club in the last four of the European competition.

The Belgium winger has bagged 14 goals and managed seven assists in the league so far. Oscar believes Chelsea will miss Hazard's contribution, but remains confident the players in the squad are capable of replacing the 23-year-old during his absence.

"We will miss Eden [Hazard] but we have proved we have a strong enough squad. We hope he recovers soon and that we play well against Swansea," Chelsea's Brazilian star concluded.

Chelsea make a trip to Wales to face Swansea City in the Premier League fixture on Sunday.