The Europa League resumes this week as the round of 16 is finally completed – almost five months after it started.

Six of the eight ties have second legs to be played while two fixtures are now one-off games.

Here, the PA news agency runs down the teams remaining in the competition.

Shakhtar Donetsk

The Ukrainian side, winners of this tournament in 2009, are leading Wolfsburg 2-1 going into the second leg. They come into the competition with some recent success, having wrapped up another league title in July.

Wolfsburg

Wolfsburg had a mixed time following the resumption of the Bundesliga in May, winning just four of their nine games to finish in seventh position. They finished their domestic league at the end of June and have had time off, but played RB Leipzig in a friendly at the weekend.

FC Copenhagen

Having been in regular action since mid-May, the Danish side should be in good shape to overturn a 1-0 first-leg deficit to Istanbul Basaksehir. Copenhagen are second in the Superliga, having won their last two games.

Istanbul Basaksehir

The Bundesliga side have it all to do in Switzerland and will have to regain their sharpness having been off-season for the last month. They ended their domestic season well and have been in friendly action against Monaco recently.

Wolves

Wolves would have been one of the sides disappointed that the season ground to a halt as the restart saw them miss out on European qualification through the league. They must now win the tournament to ensure they are playing in Europe next season and will be confident of making the next stage as they host Olympiacos for the second leg tied at 1-1.

Olympiacos

The Greek side know all about English opposition this season, having played Tottenham in the Champions League and knocked Arsenal out of the Europa League. They romped to their domestic league title, with 91 points from 36 games, so will arrive in England full of confidence.