By Sedara Oluwadara   Manchester United's Portugal forward Cristiano Ronaldo, 37, has received an offer of 300m euros (£254m) to play for two seasons for a club in Saudi Arabia. (TVI and CNN Portuguesa, via AS - in Spanish)   United are holding final talks over signing Lisandro Martinez from Ajax after agreeing personal terms with the Argentina defender, 24. (Fabrizio Romano, Twitter)     Ajax have accepted defeat in their bid to prevent Martinez from leaving this summer - but the Dutch champions want to receive a fee of £46m. (Times - subscription required)   Chelsea are now targeting