The 170-year old firm has sold its 51 per cent stake in Hoteles Y Clubs De Vacaciones to the hotel arm of Iberostar for €72m (£60.7m).
Sam Weihagen, acting chief executive, said the sale, which will reduce Thomas Cook’s net debt by €94.6m, showed the firm’s “ongoing commitment to strengthen the balance sheet”.
Thomas Cook shares nose-dived last month after the operator postponed its results and asked its syndicate of 17 lenders to come to the rescue with a further £100m of financing.
The company has issued three profit warnings in the past 19 months and warned of deteriorating trading conditions, and is looking to sell up to £200m non-core assets over the next six to 18 months.
Shares fell 2.95 per cent to 14.82p.