No, the joke has past you by,
it is an implication that Tottenham Hotspur, the football team Gareth Bale (The said 'Bale' in the one-liner) plays for are what is known as a 'one man team' due to their results taking a negative direction since Bale has picked up an injury.
Gareth Bale is Welsh, so the idea there will be three Welsh teams in the Premier League is a rib on this.
Well I think it is unlikely Bale will be in the premier league next season so the joke is on you.