Only the last round of matches remains in the 2013-14 Champions League group stage – but just half of the qualifiers for the last 16 are known.
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Group D is the only one in which both places in the knockout phase have already been filled and Bayern Munich, 5/2 favourites with bookmaker bwin
to retain the trophy, will take top spot if they avoid a two-goal defeat at home to Manchester City on Tuesday.
City and the three other English clubs involved can all finish top of their groups, with Chelsea FC the most likely to do so as it would be assured with victory at home to Steaua Bucharest on Wednesday.
The other qualifier from Group E will be either Schalke or Basel, with only a home win good enough for the German side.
Arsenal FC will finish top of Group F if they avoid defeat away to Napoli on Wednesday, with Borussia Dortmund in pole position to join them at the expense of the Italians.
Manchester United are through but also need a point to finish top, although defeat at home to Shakhtar Donetsk would clinch first place for the Ukrainians and send Bayer Leverkusen tumbling out.
Juventus will join group winners Real Madrid in advancing from Group B if they can win or draw away to Galatasaray.
Paris Saint-Germain have wrapped up the leadership of Group C and Olympiakos will also qualify with victory at home to Anderlecht, with the Greeks long odds-on to claim three points from that fixture.
Group G winners Atletico Madrid can still influence who joins them in the last 16 because a home win at the Vicente Calderon Stadium would end the hopes of visitors Porto and grant a passage to Zenit St Petersburg.
Barcelona can still be caught for top spot in Group H, but success at home to eliminated Celtic would end any doubts and leave AC Milan and Ajax squabbling over second spot, with the Italians only needing a draw at the San Siro.