Graeme Souness says this is the best Tottenham team he has ever seen - but they need to spend big money on players this summer.
The Sky Sports expert was talking after watching Mauricio Pochettino's team beat Manchester United 2-1 in the final game at White Hart Lane to secure second spot in the Premier League after an undefeated season at home.
Souness was full of praise for the Tottenham side, but says it would be a risk to expect them to become champions next season and he urged the board to invest in the squad again over the summer.
"I've said it before, I think this is the best Tottenham team I've ever seen," he told Super Sunday.
"I think they've got a bit about them in every department. They'll take you on physically, they are a good football team and they've got some very special players.
"Going forward, in theory, they should only get better. What they have to do is not sit on their laurels.
"The board shouldn't listen to people like us saying what a fabulous team they've got, they should be saying 'we are going to have to go out and strengthen next year' - because it's guaranteed Chelsea will, the team that finished above them.
"They've got to go out and spend big money again. Prove to the fans they are the real deal and are going to have a right go.
"You don't sit back and wait for this team to become champions because that might not happen. Some of them might not get any better.
"You've got to add to the squad and have a right go because they are that near. They are not very far away."
Souness also feels Spurs need to hold on to their star names, such as Harry Kane and Dele Alli, insisting they should not sell to a Premier League rival at any cost.
However, he admitted it would be hard to stop any player moving to Real Madrid, Barcelona or Bayern Munich.
"They shouldn't be selling to any other English clubs," Souness added.
"Even if you were playing for the best team in this country, I think there's two and maybe three. If the big two in Spain come along it's very hard to say 'I don't want to go'.
"I don't care who you are, it's very difficult. Then there's Bayern Munich to a lesser extent.
"But I think this team should not be selling any of their best players in England."