United striker has described Greenwood's ability as "scary" and believes Ole Gunnar Solskjaer must harness the 18-year-old's potential over the next few years.Greenwood enjoyed a breakthrough season, scoring 17 senior goals. But there has been some concern that, if United land Sancho from Dortmund, Greenwood's role could be reduced.“Mason is scary, absolutely scary,” Cole told the Press Association.