Manchester United Transfer News: Zlatan Ibrahimovic, Grigoris Kastanos Rumours

Manchester United are reportedly considering adding another year onto Zlatan Ibrahimovic's contract following the Swede's impressive start to his Old Trafford career.

The 34-year-old moved to United from Paris Saint-Germain on a free transfer in the summer and has netted four goals in his first four Premier League games at the club, per WhoScored.com.

Upon his arrival at Old Trafford Ibrahimovic penned a one-year deal with the option of another season and there is a "strong possibility" a further year could now be added, according to Paul Hetherington in the Daily Star. 

Hetherington reported that United have been "amazed at his fitness levels and professionalism" after the Sweden international demanded at his medical to know the best scores from the club's previous tests and then beat them.

United revealed as much on their Twitter feed:

It is likely that the Red Devils believe Ibrahimovic will still be able to maintain his current impressive form into his late 30s, hence why they are considering adding another year to his deal.

Despite being 34 he has showed no signs of slowing down, with his recent goalscoring record quite remarkable, per Match of the Day:

He is not a player who particularly relies on pace to be successful and so has managed to maintain his level despite getting older.

Given Ibrahimovic's impressive fitness record he could well play on for another three seasons, and United are seemingly preparing already to reward him for his fast start to Old Trafford life.

Meanwhile, United boss Jose Mourinho has reportedly sent scouts to watch Juventus youngster Grigoris Kastanos, and the Red Devils could make a move for the Cypriot midfielder, per Paul Joyce in the Express.

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Joyce added that the 18-year-old is currently in contract talks with Juve, and the club want to increase his release clause to £17 million, an indicator of how highly they rate him.

Already a two-time senior international, Kastanos looked confident as he started in the No. 10 role for Cyprus against Belgium in a recent FIFA World Cup qualifier.

He has immense potential and could well be a future star of the European game, so it is little surprise that United are interested in him.