TUI and Direct Line tussle for FTSE 100 place The constituents of the blue-chip index are due to be reviewed this week, with the holiday company and the recently floated insurance group competing to make it into the top flight. However, traders and analysts said they expect TUI to win the race . FTSE Group will determine the membership of its indices by ranking companies by market capitalisation at the close on Tuesday. Shares in the travel group finished up 0.8 at 286½p on Friday night, valuing the business at £3.2bn. Direct Line had a market value of £3bn at the end of last week and would be hard-pressed to make up the ground in two days of trading. EasyJet, at £2.9bn, also has an outside chance. Water company Pennon Group is seen as the most likely candidate for demotion to the mid-cap FTSE 250. Shares in the group fell almost 14pc in November, hurt by a profit warning at its waste management division Viridor and wider regulatory uncertainty in the sector. TUI , which owns the First Choice and Thomson brands, has been a member of the benchmark index before, from the end of 2007 to June 2011. Shares changed hands for as little as 158p in June, but investor confidence in the company has since begun to return. "They had a very good summer in the UK, helped partly by the awful weather conditions in this country and problems at their major competitor Thomas Cook," said Jeffrey Harwood, an analyst at Oriel Securities.