This article is part of Football FanCast's Opinion series, which provides analysis, insight and opinion on any issue within the beautiful game, from Paul Pogba's haircuts to League Two relegation battles...

Son Heung-min has been in selfless form since Jose Mourinho’s appointment as Tottenham Hotspur manager.

The South Korea international, such a prolific outlet on the left flank, has scored one goal in the Portuguese’s first four games against West Ham United, Olympiacos, AFC Bournemouth and Manchester United.

Fascinatingly, though, he has also provided four assists.

In the 10 league games prior, he had registered three assists, per WhoScored.

In total, against Bournemouth and West Ham, he laid on seven key passes, along with one against Olympiacos.

This is a player who is willing to sacrifice himself for the team and that is only further emphasised by his heat maps.

In both league games, we can clearly see that he tracks back, looking to help his defender before then springing forward.

Versus West Ham, he rarely touched the ball in the box, though he did provide the assist for Lucas Moura’s goal from the left flank while against the Cherries, he appears to hare both up and down the line, looking to both defend but also attack.

Son is something of a Duracell bunny, such is his ability to keep running and keep working but, under Mourinho, he has become more of a creative outlet than the stone-cold finisher he was becoming under Pochettino. Against Manchester United, of course, he did not manage to provide an assist but he did complete eight dribbles as he repeatedly looked to get to the byline.

Last season, after all, he scored 20 goals in all competitions and provided 10 assists.

If this carries on, those numbers could well be reversed under Mourinho this term.

Meanwhile, Spurs fans have reacted to a report ahead of the January transfer window.