(Reuters) - Chelsea's new striker Romelu Lukaku has all the attributes to greatly improve the London club's attack and bridge the gap to their fellow Premier League title contenders, manager Thomas Tuchel said on Friday.

The lethal Belgian completed a 97.5 million pounds ($134.6 million) return to Chelsea on Thursday after two years at Inter Milan where he helped the Italian club to their first Serie A title in 11 years last season.