Bayer Leverkusen coach Roger Schmidt knows the threat Tottenham pose in the Champions League - because he witnessed their victory over Manchester City.

Schmidt was scouting in the crowd earlier this month as Spurs took Pep Guardiola's side apart at White Hart Lane with a convincing 2-0 victory.

They now face Leverkusen at the BayArena tomorrow in what is a crunch match in Group E, with the German side sitting third and only two points behind their opponents.

"Tottenham play great football, it was a great atmosphere at White Hart Lane, they are a very strong team and certainly deserved the 2-0 win," Schmidt said.

"You can see they've invested in all aspects of their game, they are very well organised, very aggressive, also in terms of switching play once they have won possession, and very solid defensively. They are very strong opposition.

"Equally, in terms of the Champions League, this is when it really gets going here at the BayArena, this is a stage where we can show what we can do, there is no better chance for us and no better opposition for us to show that against in this group."

Son Heung-min, instrumental in the win over City, is likely to have an extra spring in his step after he spent two years at Leverkusen before moving to north London, scoring 21 goals in 62 league appearances for the club.

The South Korean endured a stop-start opening season under Mauricio Pochettino and even asked to be sold in the summer but five goals in seven this term has indicated a return to form.

"We have to keep an eye on every player but from seeing the game at White Hart Lane, Son had an excellent game there," Schmidt said.

"We know what he's about. He spent a year here with me, he's a great player and a great person as well.

"After a tricky first year [at Tottenham], he is now showing his real potential, and I hope he carries on in that vein with the possible exception of tomorrow night."

Leverkusen have weapons of their own. Captain Lars Bender missed Saturday's 2-1 defeat to Werder Bremen with flu but has returned to training.

Hakan Calhanoglu, Charles Aranguiz and Julian Brandt form a talented midfield.

And Javier Hernandez, considered surplus to requirements at Manchester United, has already hit seven goals in nine games this season, after finishing the last one with 26 in 43.

"The stats show that when he's had a chance to play, he scores goals," Schmidt said of Hernandez.

"Also consider that he has played for Manchester United and Real Madrid, two of the top teams in Europe, where there is stiff competition.

"Even then when coming on as sub, he has done well. Now that he has chance to play more 90 minutes, I think you can see he has more enjoyment in his game."

Schmidt's side showed their quality in a 2-0 win over Borussia Dortmund this month, on the same weekend Spurs beat City, but they have made a slow start in the Bundesliga.

Bremen's win on Saturday leaves Bayer 10th in the table, having won three, lost three and drawn one of their opening seven matches.

"Last weekend was a setback but we don't have to take it too seriously," defender Jonathan Tah said.

"We will need to be fully on the case mentally tomorrow, give the best we can, and show what we can do on the pitch."