Rob Carnell, chief international economist at ING Commercial Banking, explains why Greece's future without proper debt relief isn't appealing.
Alan Higgins, chief investment officer of U.K. at Coutts, explains why he takes a contrarian view and thinks that Greece's debt is sustainable.
Commerzbank has suggested that previous EM debt crises show that Greece cannot reduce its debt/GDP ratio while in the EU. Simon Quijano-Evans, head of EM research at Commerzbank, explains.
Philip Shaw, chief economist at Investec, discusses the size of Greece's debt pile and whether it can be eroded.
European Central Bank staff are considering increasing haircuts on Greek bank collateral, sources told CNBC. Annette Weisbach reports.
Kyriakos Mitsotakis, Greek MP at the New Democracy Party, says he sees "no conceivable option" for Greece to default, as it would be "a completely catastrophic scenario."
Regarding Greece's debt negotiations, Jeroen Dijsselbloem, president of the Eurogroup, says "We have to stop wasting time and really start talks now seriously."
Pierre Gramegna, finance minister of Luxembourg, says that all of Greece's reforms need to be accelerated.
Endy Kenny, Taoiseach of Ireland, talks about his country's relationship with the Troika and gives some advice to Greece.
CNBC's Julia Chatterley talks to Elena Panaritis, an adviser to the Greek Government, about the ongoing debt negotiations.
CNBC's Annette Weisbach reports on the European Central Bank denying reports of capital controls for Greece.
Edmund Shing, global equity portfolio manager at BCS Asset Management, says the European Central Bank is heaping more pressure on the Greek government by indirectly leaking the potential for capital controls.
James Davidson, fund manager at JPMorgan Asset Management, discusses Greek debt negotiations in terms of a Grexit and its potential for contagion.
Darren Ruane, head of fixed interest at Investec Wealth and Investment Limited, says the euro zone would like to put the Greece situation "to bed."
Anatole Kaletsky, co-founder and chief economist at Gavekal Dragonomics, says Greece's finance minister, Yanis Varoufakis, is "holding a gun to his own head."
Richard Kelly, head of global strategy at TD Securities, says Greece's desire to receive money without conditionality was unacceptable to the euro zone.
Discussing Greece's debt negotiations, Azad Zangana, European economist at Schroders, says it's likely there will be some extension to the country's current bailout program.
José Manuel Durao Barroso, former president of the European Commission and visiting professor of international economic policy at Princeton University says that it would be "a huge mistake" for the euro zone to allow one country to bend the basic euro zone rules.
European markets ended slightly lower Monday as investors focused on fresh Russian sanctions from the European Union and negotiations between Greece and the rest of the euro zone over its debts.
Discussing the Greek debt negotiations, Michael Gallagher, director of research at Idea Global, says we're getting closer to a deal, hopefully within the next week.