The German striker took to social media after Queens Park Rangers drew 0-0 with the Bluebirds.
The Scottish Championship side claimed a dramatic victory over their Old Firm foes on Sunday.
Son has struggled to establish himself at Spurs this season.
Derby County won against Charlton Athletic in the Championship on Saturday.
The Liverpool manager has rubbished claims that he does not have a strong working relationship with the Reds youngster.
Aston Villa will play in the Championship next season and so will Nottingham Forest.
The Hammers boss admits he was "gutted" to see his side concede a last-minute leveller and feels they did more than enough to deserve to win.
Newcastle United had a weekend to remember for all the right reasons.
Ibrox side Rangers have progressed to the final of the Scottish Cup.
West Ham were pegged back late on to draw 2-2 with Leicester City.