The Senegal international has yet to score in the Premier League this season and the ex-Toon star believes that his poor understanding of the offside rule is the major factor
The Senegalese was a revelation early in his Magpies career following his move from Bundesliga club Freiburg but has struggled this season, failing to score in any of his 10 Premier League appearances.
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"Remy's doing exceedingly well, he's very quick and he gets his timing right," Macdonald told Sports Direct News.
"I just wish Papiss Cisse would take notice of what Loic Remy does because Cisse doesn't understand the offside rule and how to work it as a forward.
"Until he does he's not going to be worth anything to Newcastle United at all because other sides have seen his weakness and now play on it.
"Either he's got to come 10 or 15 or even 20 yards onside or the opposition will keep playing him into an offside trap. But, with regards to Remy, he's doing ever so well."