Image source, Reuters

Elsewhere around Europe, in the 18:00 GMT kick-offs, Dutch champions Ajax take a 1-0 lead to Legia Warsaw thanks to Arkadiusz Milik's first-half strike at the Amsterdam ArenA, but the hosts were lucky to hold on to the lead against the Polish side.

Vicente Iborra's goal in Spain has given last year's winners Sevilla a 1-0 edge going into the away leg at German side Borussia Monchengladbach, but Unai Emery's side have suffered a dip in form recently.

Fellow Spaniards Villarreal, semi-finalists in 2011, take a narrow advantage to Salzburg after a 2-1 win at the Estadio el Madrigal but FC Red Bull have what could prove to be a crucial away goal thanks to Jonathan's penalty.

John Guidetti is given the responsibility of leading Celtic's attack at the San Siro after coming on as a substitute to score the late equaliser in last Thursday's first leg, which ended 3-3. Gary Mackay-Steven and Stuart Armstrong - rested for Sunday's 4-0 Scottish Premiership win over Hamilton - are recalled to play behind him in place of James Forrest and Kris Commons. Adam Matthews replaces Efe Ambrose at right-back.

Celtic XI: Gordon; Matthews, Denayer, van Dijk, Izaguirre; Brown, Bitton; Mackay-Steven, Johansen, Armstrong; Guidetti

Image source, @EuropaLeague

Dark clouds await Tottenham at Fiorentina's Artemio Franchi stadium. Hopefully it's a bit fuller than that now.

Nemanja Vidic, Mo Salah, Demba Ba, Micah Richards, Borja Valero, Lukas Podolski, Alberto Aquilani - there are a whole host of former Premier League players coming up against British opposition tonight.

But if you could see one former Prem player back in the English top flight next season - who would it be, and why?

Obviously Cristiano Ronaldo. He goes without saying. But who else? The more personal the reason, the better.

Image source, Getty Images

Mine would probably be Rafael van der Vaart. He was class.

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With a Champions League place on the table, you'd expect Tottenham to be going full gun for the Europa League. However, they play Chelsea in the League Cup final. On Sunday.

Not ideal scheduling. Not ideal at all. It's a pretty strong line-up from Spurs tonight though. Would fans have wanted to see Christian Eriksen rested?

Image source, @LFC

The fans are already starting to file in to Besiktas' Ataturk Stadium in Istanbul to 'welcome' Liverpool.

Image source, @LFC

Image source, PA

I am contractually obliged to recall that night in Istanbul 10 years ago.

Liverpool return this evening to the scene of their incredible Champions League triumph in 2005, when they came from 3-0 down to beat AC Milan.

If tonight's game is 8% as exciting or memorable we'll do well.

Tottenham

With the League Cup final against Chelsea looming on Sunday, Mauricio Pochettino keeps Harry Kane, Ryan Mason and Danny Rose on the bench, but there are starts for Christian Eriksen, Erik Lamela and Roberto Soldado.

Plenty of recognisable faces in the Fiorentina line-up, with ex-Man City duo Micah Richards and Stefan Savic joined in the back four by former Bolton full-back Marcos Alonso, and Chelsea loanee Mohamed Salah up front.

Fiorentina XI: Neto; Richards, Savic, Basanta, Alonso; Badelj, Pizarro, Fernandez; Joaquin, Gomez, Salah.

Subs: Lezzerini, Gonzalo, Pasqual, Tomovic, Aquilani, Ilicic, Babacar.

Tottenham XI: Lloris; Chiriches, Fazio, Vertonghen, Davies; Bentaleb, Stambouli; Chadli, Eriksen, Lamela; Soldado.

Subs: Vorm, Rose, Walker, Mason, Paulinho, Townsend, Kane.

Mario Balotelli starts tonight. He stole the headlines in the first leg with his late penalty winner at Anfield.

But taking a one-goal lead to Turkey is likely to lead to a nervy evening for Reds fans. It's not like they've squeaked a result at the Ataturk Stadium before though...

Demba Ba has recovered from the calf problem that forced him to miss of Sunday's 1-0 defeat at Eskisehirspor to lead the Besiktas attack, while former Chelsea youth winger Gokhan Tore is over the ankle knock that kept him out at the weekend. Daniel Opare comes in at left-back with Ramon Motta suspended, while Necip Uysal and Pedro Franco form the centre-back partnership as Ersan Gulum is banned.

Besiktas XI: Gonen; Kurtulus, Franco, Uysal, Opare; Hutchinson, Kavlak; Tore, Sosa, Sahan; Ba.

Three Premier League sides and Scottish champions Celtic are in the hunt for the Europa League.

Here's tonight's key games and aggregate scores as we get set for the second legs of these last-32 ties:

Besiktas (0) v (1) Liverpool - 18:00 GMT

Fiorentina (1) v (1) Tottenham - 18:00 GMT

Inter Milan (3) v (3) Celtic - 18:00 GMT

Everton (4) v (1) Young Boys - 20:05 GMT

Liverpool

Mario Balotelli starts a Liverpool game for the first time since 8 November. He will play alongside Daniel Sturridge, who is also restored to the starting line-up in a side showing four changes. Jordan Henderson and Philippe Coutinho are injured, Lazar Markovic is suspended and Adam Lallana drops to the bench. Emre Can moves forward into central midfield to cover for Henderson, defender Kolo Toure makes his first appearance since helping Ivory Coast win the Africa Cup of Nations, and Alberto Moreno comes in for Markovic at left-wing-back.

Liverpool XI: Mignolet; Lovren, Skrtel, Toure; Ibe, Can, Allen, Moreno; Sterling; Balotelli, Sturridge.

The 'Green Green Grass' to the Champions League's 'Only Fools and Horses.'

The Wings to the Champions League's Beatles.

'Swiss Tony' to the Champions League's 'Fast Show.'

The Europa League may be European club football's spin-off series, but with the final in Warsaw now just 90 days away, it's time to start taking interest.

Four British teams remain in with a shout of reaching the final - and with a place in next season's big show guaranteed for the winners, it's all getting very serious from here on in...