According to BBC
The US international, 35, was brought of at half-time in Everton’s 1-0 defeat to Stoke City on Boxing Day. Joel Robles took his place, and is now expected to deputise in Howard’s absence. Manager Roberto Martinez said: “I thought Joel was very calm against Stoke and did well against Newcastle, but we will assess whether we need cover.”
“Tim will be out for between five and six weeks. It is an injury to his left calf. As a goalkeeper it’s really unusual to get an injury by kicking a ball.”
With the January transfer window opening in a couple of days, Everton could well bring in a shot-stopper on loan until Howard fully recovers.
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