Chelsea`s Lampard and Ivanovic ruled out for a month

London: Chelsea midfielder Frank Lampard and defender Branislav Ivanovic will be out of action until the end of January, the Chelsea website ( reported on Wednesday.

Following a 3-0 Premier League win at Southampton that left his side two points behind leaders Arsenal, manager Jose Mourinho said the injuries they sustained in Saturday`s 2-1 home win over Liverpool would rule the pair out for about a month.

Serbian Ivanovic suffered a knee injury and was substituted in the first half while England international Lampard sustained a muscle injury and did not come out for the second half.

They will miss Sunday`s FA Cup third round tie at Derby County before Chelsea play league games at Hull City and at home to Manchester United and West Ham United later this month.