[Greece's Prime Minister Alexis Tsipras arrives at the EU summit in Brussels]Greek Prime Minister Alexis Tsipras is expected to reshuffle his cabinet by Saturday, aiming to speed up the conclusion of a key bailout review and shore up his government's popularity ratings, senior government sources told Reuters on Friday. Finance Minister Euclid Tsakalotos, the key negotiator between Athens and its international lenders - the European Union and the International Monetary Fund - is expected to keep his post. Government sources have said that Tsipras may replace Energy Minister Panos Skourletis who has openly opposed privatisations, a sign that Athens wants to appease its creditors that have accused it of foot-dragging in selling state assets, a key term of its third bailout.