The Chelsea manager criticised Manchester United's deal to sign the teenager from Southampton but the new Old Trafford boss refused to hit back at the Portuguese in publicLouis van Gaal says he will speak to Jose Mourinho privately after the Portuguese claimed signing Luke Shaw would have “killed” Chelsea.
The Red Devils paid £27m to acquire the 19-year-old left-back from Southampton, agreeing to pay him a salary of £160,000-per-week, while the Blues pulled out of any prospective deal after learning of the teenager's demands.
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"We would have killed our stability with financial fair play, and killed the stability in our dressing room."
Van Gaal, however, refused to bite back in public, instead revealing that he will speak with the Chelsea boss in private.
“I don't have to answer, I don't think I have to discuss things with the media. Its better to discuss it with Jose,” he told reporters in the build-up to United's pre-season clash with Roma.
Shaw made his United debut in the club's 7-0 win over LA Galaxy in midweek, featuring as a wing-back in Van Gaal's 3-5-2 formation.
The Dutchman's second game in charge comes against the Serie A runners-up on Saturday and Van Gaal slammed the scheduling of the fixture, admitting he will attempt to persuade the referee to allow a drinks break – as seen in the World Cup.
“It is unbelievable that we play at two o’clock,” he said. “We will adapt to the situation because all the players will play for 45 minutes except [Tom] Cleverley.
“For the players, it is very hard and I hope I can persuade the referee to have a drinks break as I did in Fortaleza [when Netherlands played Mexico].
“We have a sports science department and it shall be done very well with the conditions, especially those players who will play 45 minutes.”