US markets are down 1% and the FTSE has moved into the red after the German finance minster dampened hopes for next weekend's EU summit.
The Royal Bank of Scotland (RBS) has been labelled the "most vulnerable" bank in Europe by Credit Suisse, in a note which also warns it may need further state aid.
The S&P 500 has opened down 0.85%, with financials under pressure after J.P. Morgan reported its third quarter results.
The S&P 500 closed up 3.4% overnight, boosting Asian shares and lifting the US index nearly 11% from lows seen last week.
The number of shares out on loan in September has risen by the highest level in five years as investors reacted to market falls by taking more negative bets.
The FTSE 100 has fallen as much as 3.5% as fresh eurozone concerns pushed the index down to the 4,900 mark.
The FTSE 100 has found support around the resistance level of 5,000 points as investors weigh up Greece's latest troubles.
France, Italy and Spain have extended bans prohibiting the short-selling of selected financial stocks until at least mid-November.
Lloyd George Management has appointed Thomas Vester Nielsen to run its newly launched Frontier Markets equity strategy.
Goldman Sachs AM chairman Jim O'Neill has proposed an alternative 'rules-based investing approach' he believes can produce lower risk equity market returns.