The path to the Puskas Arena in Budapest will be known on Friday when the draw for the quarter and semi-finals of the Europa League are held.
Sixteen teams are vying for spots in the draw with the second legs of the last-16 taking place on Thursday.
Last week’s first legs saw four sides earn give themselves a strong cushion, while the remaining half of the ties look delicately poised.
The Europa Conference League last-16 will also conclude on Thursday, as teams look to take the next step towards the final in Prague.
Sportsmail takes you through each of the ties, reminding you what happened in the first leg and filling you in on events in the meantime.
Arsenal vs Sporting Lisbon (2-2)
Mikel Arteta surprised many by naming several key players in Arsenal’s starting XI in the first leg, with Bukayo Saka, Granit Xhaka and Gabriel Martinelli among those risked, despite chasing the Premier League title.
The Arsenal boss clearly has no desire to sacrifice the Europa League and is expected to field another strong team at the Emirates.
His side escaped the first leg with a point after an absorbing match at the Estadio Jose Alvalade.
William Saliba had given the Gunners the lead on the night with a towering header from a corner, but Goncalo Inacio and Paulinho turned the tie around for Sporting.
Sporting will feel unfortunate to not be heading to north London with an advantage to protect, after Xhaka’s shot deflected off Hidemasa Morita and into his own net to level the tie at 2-2.
Both teams head into the second leg fresh from 3-0 league wins on Sunday.
With Sporting lying 15 points behind league leaders Benfica and seven off a Champions League spot, progression in the Europa League would represent a massive boost to their season.