The West Ham United star was classified as a midfielder in 2017/18 but has now been changed to a forward.
Arnautovic failed to produce a single goal or assist in the first 15 Gameweeks but then profited from a move up front.
The Austrian ranked among the top five players in the entire game for shots (60) and goals (11) from Gameweek 16 onwards.
Arnautovic also went on to finish with seven assists, prompting his reclassification as a forward for this season.
Wilfried Zaha (£7.0m) is another to find his position redefined from a midfielder to a forward.
He was moved from the wing to centre-forward in Gameweek 30 for Crystal Palace last season.
After this switch Zaha recorded five of nine goals, four of his seven assists and all eight of his bonus points.
Much like Arnautovic, he can benefit from an extra boost in the Bonus Points System (BPS).
Forwards score 24 points in the BPS for every goal scored, whereas midfielders are awarded 18.
This could have a major impact on his potential.
As a midfielder, Young earned only one point for each of his nine clean sheets in 2017/18.
But as a defender, he will now receive four points.
Young's attacking prospects can also benefit.
Midfielders receive five points for every goal scored, whereas defenders collect six.
Young scored two goals last season and also supplied six assists.